Provided by: sunclock_3.57-13build2_amd64 
NAME
sunclock - a fancy clock for the X Window system, providing local time (legal time and solar time),
sunrise, sunset and various geographical data through a point and click interface.
SYNOPSIS
sunclock [ options ]
where the list of licit options is the following long list (starting from (**) the options are
configurable at runtime):
[-help] [-listmenu] [-version] [-citycheck] [-display name] [-sharedir directory] [-citycategories value]
[-clock] [-map] [-dock] [-undock] [-menu] [-nomenu] [-selector] [-noselector] [-zoom] [-nozoom] [-option]
[-nooption] [-urban] [-nourban]
(**) [-language name] [-rcfile file] [-command string] [-editorcommand string] [-mapmode * <L,C,S,D,E>]
[-dateformat string1|string2|...] [-image file] [-clockimage file] [-mapimage file] [-zoomimage file]
[-clockgeom <geom>] [-mapgeom <geom>] [-auxilgeom <geom>] [-menugeom <geom>] [-selgeom <geom>] [-zoomgeom
<geom>] [-optiongeom <geom>] [-urbangeom <geom>] [-title name] [-clockclassname name] [-mapclassname
name] [-auxilclassname name] [-classname name] [-setfont <field>|<fontsetting>{|<languages>}] [-verbose]
[-silent] [-synchro] [-nosynchro] [-zoomsync] [-nozoomsync] [-placement (random, fixed, center, NW, NE,
SW, SE)] [-placementshift x y] [-extrawidth value] [-decimal] [-dms] [-city name] [-position
latitude|longitude] [-addcity size|name|lat|lon|tz] [-removecity name (name|lat|lon)] [-rootdx value]
[-rootdy value] [-fixedrootpos] [-randomrootpos] [-screensaver] [-noscreensaver] [-rootperiod value (in
seconds)] [-animation] [-noanimation] [-animateperiod value (in seconds)] [-progress number[s,m,h,d,M,Y]]
[-jump number[s,m,h,d,M,Y]] [-aspect mode] [-colorlevel level=0,1,2,3] [-fillmode number=0,1,2]
[-coastlines] [-contour] [-landfill] [-shading mode=0,1,2,3,4,5] [-diffusion value] [-refraction value]
[-night] [-terminator] [-twilight] [-luminosity] [-lightgradient] [-nonight] [-darkness value<=1.0]
[-colorscale number>=1] [-mag value] [-magx value] [-magy value] [-dx value ] [-dy value] [-spotsizes
s1|s2|s3|... (0<=si<=4, 1<=i<=citycategories)] [-sizelimits w1|w2|w3|... (wi = zoom width values,
1<=i<=citycategories)] [-citymode mode=0,1,2,3] [-objectmode mode=0,1,2] [-sun] [-nosun] [-moon]
[-nomoon] [-tropics] [-notropics] [-meridianmode mode=0,1,2,3] [-parallelmode mode=0,1,2,3]
[-meridianspacing value] [-parallelspacing value] [-dottedlines] [-plainlines] [-bottomline]
[-nobottomline] [-reformat] [-vmfcolors color1|color2|color3...] [-vmfrange a|b|c|d] [-vmfcoordformat
format] [-vmfflags integer] [-setcolor field|color]
DESCRIPTION
sunclock is an X11 application that displays a map of the Earth and shows the illuminated portion of the
globe. In addition to providing local time for the default timezone, it also displays GMT time, legal
and solar time of major cities, their latitude and longitude, the mutual distances of arbitrary locations
on Earth, the position at zenith of Sun and Moon. Sunclock can display meridians, parallels, tropics and
arctic circles. It has builtin functions that accelerate the speed of time and show the evolution of
seasons. Sunclock can be internationalized for various western languages. It is possible to customize the
app-default file and enter additional city entries.
Sunclock can commute between two states, the "clock window" and the "map window". The clock window
displays a small map of the Earth and therefore occupies little space on the screen, while the "map
window" displays a large map and offers more advanced functions. The Sunclock package includes a
resizable and zoomable vector map . External Earth maps can also be loaded (starting with version 3.51,
formats .jpg, .gif, .png, .xpm or .xpm.gz, .vmf can be read [.vmf is the specific vector map format of
sunclock]). Some additional formats could be added in the future.
The map window can work in five different modes:
- "Legal time" mode: legal time of default time zone and GMT time are displayed.
- "Coordinate" mode: by clicking on a city, users get coordinates (latitude, longitude) of that city,
legal time and sunrise/sunset.
- "Solar" mode: by clicking on a point of the map (either a city or another point), solar time and day
length are shown.
- "Hour Extension" mode: displays solar times from 00:00 to 23:00 in bottom strip, according to the Sun
position.
- "Distance" mode: shows distances in km and miles between two arbitrary locations.
Depending on the mode chosen, the bottom line shows a short text displaying the requested information.
The bottom line can be scrolled to the right or to the left by pressing the PageUp/PageDown and Home/End
key arrows.
A further functionality is the "Progress" feature, which allows one to accelerate the evolution of time,
so as to observe the evolution of day/night periods and seasons. By default, the Sun and Moon are also
shown on the map (rather, the positions of Earth where Sun and Moon are at zenith are shown).
Coordinates of meridians, parallels, cities, the names of cities can be displayed on the map.
All functionalities can be accessed though GUI actions on the main window or the auxiliary windows. The
main window is resizable by pulling the window edges - as the current window manager permits it. There
are 5 auxiliary windows:
- Menu Window. This is the main menu, which offers a wide list of actions. The menu window is launched
by typing 'H' or clicking on the bottom strip with the left mouse button once. Each action can be
obtained by using the indicated keyboard shortcut or by clicking with the mouse on the corresponding
entry. Upper/lower case is irrelevant, except for options or actions which have more than 2 switches.
Lower case then rotates the switches in one direction, upper case in the other direction. For those
switches, the left mouse button will have the same effect as lower case, and the right mouse button the
same effect as upper case.
- File Selector window. It can be accessed by clicking on the upper part of the main window with the
middle mouse button. It allows one to select the Earth image file (in formats *.vmf *.xpm, *.xpm.gz,
*.jpg, *.gif, *.png) to be loaded.
- Zoom window. It can be accessed by clicking on the upper part of the main window with the right mouse
button. The zoom window allows one to select a specific area on the Earth, to translate or zoom it up to
100 times. High resolutions (larger than 10) are only recommended with the "huge" Earthmap of 11 Mbytes,
which offers clean images up to 20 times magnification at least.
- Urban selector window. Allows one to modify interactively the list of shown cities and locations.
- Option window. Allows one to reconfigure pretty much everything on the fly (colors, fonts, etc),
exactly as with the command line options.
OPTIONS
The program does not use the Xt nor any other more advanced toolkit, and hence only (!) those options
explicitly enumerated below may be used. The only needed resource is the list of coordinates and
timezones of cities to be displayed. The system administrator can possibly customize the system-wide
prepackaged config file Sunclockrc before installing the package, while users can tweak their individual
configuration file ~/.sunclockrc at any time. The individual config file ~/.sunclockrc is read *after*
the system wide config file Sunclockrc, and therefore its settings override those of the system wide
config. The command line options can be used to override ~/.sunclockrc itself.
-help Show brief help and exit.
-listmenu
Explanations on the actions available from the builtin menu.
-version
Show program version and exit.
-verbose
Make Sunclock verbose. The program then sends to stderr some information on the internal
operations performed. This is disabled by default.
-silent
Make Sunclock silent about internal operations performed. This is the default.
-citycheck
At start-up, check that there are no repetitions in the list of cities (a city is considered to be
repeated if it appears twice under the same name, with coordinates differing by at most 0.5
degree). By default no check is performed on Sunclockrc - which is supposedly correctly set up...
-display dispname
Give the name of the X server to contact.
-language name
Select language to be used in the sunclock menu and help.
-title name
Change the specification of the string which should appear in the title bar of the main and
auxiliary windows. Default is the application name, i.e., sunclock.
-classname name
Change the specification of class application name. Default is Sunclock. Other specifications can
be passed so that aware window managers might use it for configuration purposes. You might e.g.
pass -classname NoTitle-Sticky, and configure properly your WM so that it removes the title bar,
and make the window sticky with respect to the Desktop Pager. With fvwm, you could use for
instance
Style "*NoTitle*" NoTitle, WindowListHit, Sticky
Style "*ShowTitle*" Title, WindowListHit, Slippery
Style "*Sticky*" Sticky
to specify such a behaviour.
-setfont <field>|<fontsetting>{|<languages>}
Select the font for the given text field (clockstrip, menustrip, city, coord, menu). Optionally,
one can specify a list of languages for which this font setting should apply. If the <languages>
option is not specified, the font setting applies to all languages.
-rcfile filename
Read a configuration file that is different from the user default ~/.sunclockrc (if this option is
not set, the user config file defaults to ~/.sunclockrc). Notice that the app-default config file
Sunclockrc is read first, and the file set by the -rcfile option is read afterwards; therefore its
settings override those set by the system wide config file. Reading further config files is
possible at runtime, using the option window. Set -rcfile with a void string "" if you wish to
bypass the user config file step.
-sharedir directory
Set the directory where system wide shared Earthmaps are located. Default is
/usr/share/sunclock/earthmaps.
-image *.jpg (or *.gif, *.png, *.vmf, *.xpm, *.xpm.gz)
Start sunclock with an Earth map image loaded in the clock and map windows. The same map is then
used for both windows, but the clock image is usually scaled down.
-mapimage *.jpg (or *.gif, *.png, *.vmf, *.xpm, *.xpm.gz)
Start sunclock with an Earth map image loaded in the map window.
-clockimage *.jpg (or *.gif, *.png, *.vmf, *.xpm, *.xpm.gz)
Start sunclock with an Earth map image loaded in the clock window.
-zoomimage *.jpg (or *.gif, *.png, *.vmf, *.xpm, *.xpm.gz)
Use specified file as image in the zoom widget
-colorlevel level=0,1,2,3
Sets the color level (0=monochrome, 1=few colors, 2=many colors, 3=full colors). With the
"monochrome" setting, day and night appear respectively as mapbgcolor (white by default) and
mapfgcolor (black by default), and no shading is available; all other features (city names,
coordinates) appear also as monochrome. With the "few colors" setting, the menus and city spots
can be represented with dedicated colors, but the meridians/parallels/tropics are still
monochrome. With the "many colors" oprions, meridians/parallels/tropics can also be drawn in
color. In these first 3 modes, only .vmf vector maps can be loaded. These modes save a lot of
CPU power - since a simple algorithm of inversion of colors is used to set colors of all points in
the map. Monochrome mode can be useful for very slow CPUs, such as those in use in PDAs with
black and white screen. The full color mode (level=3) allows one to load jpeg or other colorful
images; day and night can be drawn with various shading parameters. This is the default and
recommended mode if you have a reasonably recent machine with enough video RAM.
-dock This option is meant to give sunclock the ability to be docked in the window manager buttons or
menu bar, providing that the WM offers this possibility without requiring special hints (fvwm2 or
windowmaker or afterstep will work perfectly well for that purpose, KDE or Gnome won't...) Under
the -dock option, sunclock locks the size of the first launched window, which is necessarily a
small clock. Also, that initial window can no longer be closed by typing 'K' or 'Q'. (The only way
to exit the application, then, is to kill it with xkill, or to undock it first with the -undock
option from the Option window). The user might want to customize the size and suitable options so
that sunclock fits with the size of the dockable applets. As an example, sunclock could be invoked
as follows:
sunclock -language fr -nobottomline -dock -clockgeom 63x42+2+190 -dateformat
"%H:%M:%S|%a%_%d%_%b|%b%_%Y|%j%_%U/52" -command "xdiary"
-undock
Undocks sunclock. This option has no other effect than reallowing the use of options that were
"frozen" under -dock. It can be used e.g. to exit the application when sunclock has been started
in dock mode.
-synchro
With this option, sunclock updates all windows simultaneously. This, of course, requires more CPU
time and may slow down sunclock's operation if too many windows have been opened. The default is
to update only the active window.
-nosynchro
With this option, sunclock only updates the active window. This is the default.
-clock Start in the clock state. This is the default and thus need not be specified.
-dateformat string1|string2|...
Set the format(s) used in the text output in the bottom strip of the clock. The default date
format consists of 3 strings:
%H:%M%_%a%_%d%_%b%_%y|%H:%M:%S%_%Z|%a%_%j/%t%_%U/52
Here %H,%M,%S stand for hour, minutes, seconds, %a for dayname, %b for monthname, %d for monthday number,
%j for yearday number, %m for month number, %y for year last two digits, %Y for year number, %t for
number of days in year (365 or 366), %Z for timezone, %U for week number (week #1 is the week with the
first thursday of the year); all other characters are reproduced as such, except %_ which stands for a
blank space, %% which stands for % and %| which stands for |. The vertical bar | is used as a delimiter
to indicate successive time formats. There can be as many formats as desired, and the actual selection
cycles through all these formats by clicking on the bottom strip with the mouse. The first string (i.e.
the one preceding the first bar) is taken as the default format. There are a few other switches, such as
%h for hour in 12-hour mode, %P fo AM/PM indicator, %G for hour in GMT time, %N for minutes in GMT time.
-map Start in the map state. Useful to start right away with advanced functionalities.
-decimal
Initializes coordinate values of geographical data in decimal degrees. However, this can still be
switched at runtime.
-dms Initializes coordinate values of geographical data in degrees, minutes and seconds. However, this
can still be switched at runtime.
-menu Raise the menu window along with the main (map, clock) window.
-nomenu
Don't raise the menu window along with the main (map, clock) window. This is the default.
-selector
Raise the selector window along with the main (map, clock) window.
-noselector
Don't raise the selector window along with the main (map, clock) window. This is the default.
-zoom Raise the zoom window along with the main (map, clock) window.
-nozoom
Don't raise the zoom window along with the main (map, clock) window. This is the default.
-option
Raise the option window along with the main (map, clock) window.
-nooption
Don't raise the option window along with the main (map, clock) window. This is the default.
-urban Raise the urban window along with the main (map, clock) window.
-nourban
Don't raise the urban window along with the main (map, clock) window. This is the default.
-aspect mode
Sets the aspect mode, i.e. the way by which zooming behaves with respect to horizontal and
vertical directions. Mode = 0 means that no synchronizations are made, mode = 1 means that the
zoom factors are always made to be equal, mode = 2 (the more subtle one) means that the horizontal
and vertical zoom factors are adjusted so that the region located near the central point of the
zoomed area will be conformal to its actual geometry on Earth, i.e. will not appear to be
distorted horizontally or vertically. This won't be true elsewhere, though, especially if the
zoomed area is large.
-zoomsync
When the option is set, the zoom window will open in synchronization mode: any zooming action made
from the main map or from the zoom window will take place as the mouse button is released (or as a
key is pressed). This is the default when the zoom window has not been opened (synchronization is
automatically set).
-nozoomsync
When set, the zoom window will open in non-synchro mode. Synchronizing the zoom will still be
possible, though, by clicking on the "Synchro" button. By default, synchronization does not occur
when the zoom window is opened, unless option -zoomsync has been set.
-mapmode * (single character = C, D, E, L or S)
Start the map functions in mode (C)oordinates, (D)istances, hour (E)xtension, (L)egal time or
(S)olar time respectively. Any other specification is ignored. Default is legal time mode.
-placement <choice> (random,fixed,center,NW,NE,SW,SE)
Specify whether commuting between clock and map windows should proceed with letting the the window
centers, respectively, the NW, NE, SW, SE corners fixed, or rather whether it should operate
randomly, or through user defined placement. Default is NW placement.
-placementshift x y
Relative displacement <clock window> --> <map window>, to apply with respect to the -placement
specification. If placement is NW, then the NW window corner will move by (x,y) pixels. Default is
(0,0), i.e. no modification to apply to the -placement specification.
-extrawidth value
When using the 'enlarge window' command specified by key '>', the width of the full X display is
used, minus some default width equal to 10 pixels. This is enough the accommodate the width of
window borders of most window managers. In case it is not, -extrawidth <value> can be used to
change this setting.
-clockgeom (width)x(height)+(xcoord)+(ycoord)
Specify the geometry of the clock window, i.e. its size and position (absolute position with
respect to the left upper corner of the screen).
-mapgeom (width)x(height)+(xcoord)+(ycoord)
Specify the geometry of the map window, i.e. its size and position (absolute position with respect
to the left upper corner of the screen).
-menugeom +(xcoord)+(ycoord)
Specify the relative position (x = horizontal shift, y = vertical shift) of the menu window with
respect to the main window, starting from the bottom edge of the main window (from its top edge in
case of SW or SE placements, see above). The y value may need an adjustment, according to the
height of the title bar allocated by the window manager, if any. In the case of the menu window,
width and height solely depend on the menufont, and therefore any given specification of width and
height is ignored. The default relative position is x = 0, y = 30.
-selgeom (width)x(height)+(xcoord)+(ycoord)
Specify the geometry of the selector window. The position specification is relative to the main
window (or to the menu, when the menu is raised). See above option -menugeom for further
explanations. The default geometry of the selector window is 600x180+0+30.
-zoomgeom (width)x(height)+(xcoord)+(ycoord)
Specify the geometry of the zoom window. The position specification is relative to the main window
(or to the menu, when the menu is raised). See above option -menugeom for further explanations.
The default geometry of the zoom window is 500x320+0+30.
-optiongeom (width)x(height)+(xcoord)+(ycoord)
Specify the geometry of the option window. The position specification is relative to the main
window (or to the menu, when the menu is raised). See above option -menugeom for further
explanations. The height specification depends solely on the selected menufont and is therefore
ignored. The default geometry of the option window is 630x80+0+30.
-urbangeom +(xcoord)+(ycoord)
Specify the relative position (x = horizontal shift, y = vertical shift) of the urban window with
respect to the main window (or to the menu, when the menu is raised). See above option -menugeom
for further explanations.
-auxilgeom +(xcoord)+(ycoord)
Specify the relative position (x = horizontal shift, y = vertical shift) of the auxiliary windows
(menu, zoom, selector, option). All relative displacements are set to (x,y).
-mag value
Rescale the image by a magnification factor equal to <value>, which must be at least equal to 1.0.
This means that the window only shows a fraction of the entire map namely, 1/<value> x 1/<value>.
Default value is 1.0.
-magx value
Same as for the -mag option, but only the x direction (width) is rescaled. Default value for magx
is 1.0.
-magy value
Same as for the -mag option, but only the y direction (height) is rescaled. Default value for
magy is 1.0.
-dx value (degrees)
Options -dx and -dy allow one to set the longitude, respectively the latitude, of the city or
location at which the zoom area should be centered. The values should be given in degrees.
Default (dx,dy) is (0.0,0.0).
-dy value (degrees)
See -dx above.
-coastlines
In the builtin vector map, generate coast lines without filling the land areas.
-contour
As before, but use a smart algorithm which eliminates lines, especially at lower resolutions (in
case the coasts are very irregular, some parts may disappear but the overall picture looks
sharper).
-landfill
In the builtin vector map, fill the land areas without generating coast lines.
-fillmode 0,1,2
Fillmode=0 is equivalent to -coastlines, fillmode=1 is equivalent to -contour, and fillmode=2 is
equivalent to -landfill.
-dottedlines
Use dotted lines to represent meridians and parallels.
-plainlines
Use plain lines to represent meridians and parallels.
-bottomline
Draw a line at the bottom of the map, to separate the map from the text strip showing time and
coordinates.
-nobottomline
Don't draw the bottom line. This is the default.
-command string
Specify an external action or program that will be called through keyboard shortcut 'x'. Default
is empty command.
-editorcommand string
Specify an external file editor program that will be called through keyboard shortcut double 'h'
(call help). Default is "/usr/lib/sunclock/emx -edit 0 -fn 9x15" (included emx editor, in no-edit
mode...)
-jump number[unit] (where unit=s,m,h,d,M,Y)
Number of seconds (respectively minutes, hour, days, Months, Years) by which the current date and
time should be shifted. No blank space should separate the number and its unit. If the unit is
absent, the number is understood to be expressed by default in seconds. Useful to get sunclock
display information on earlier or later epochs.
-progress number[unit] (where unit=s,m,h,d,M,Y)
Number of seconds (respectively minutes, hour, days, Months, Years) by which the time progression
should operate. No blank space should separate the number and its unit. If the unit is absent, the
number is understood to be expressed by default in seconds. Useful to get sunclock progress by
other steps than the predefined ones (by default the steps cycle between the values 1 mn, 1 hour,
1 day, 7 days, 30 days).
-rootdx value (between 0.0 and 1.0)
Options -rootdx and -rootdy allow one to set the position where the sunclock map is copied on the
root window in rootwindow or screensaver modes. '-rootdx 0.0' means on the left side, '-rootdx
1.0' on the right side, '-rootdy 0.0' means at the top, '-rootdy 1.0' at the bottom of the root
window. Default is 0.5 for both values, i.e. a centered map.
-rootdy value (degrees)
See -rootdx above.
-fixedrootpos
Use the above rootdx and rootdy values to fix the position of the map on the root window. This is
the default unless -screensaver has been specified.
-randomrootpos
Instead of using the above rootdx and rootdy values to fix the position of the map on the root
window, just use a random position instead. This is the default in case the -screensaver option
has been set.
-screensaver
Start sunclock in screensaver mode (no window nor any GUI controls are available in that case, and
the only way to terminate the program is to kill it explicitly).
-noscreensaver
Do not start sunclock in screensaver mode. This is the default.
-rootperiod value (in seconds, between 1 and 120 sec)
Set the period for refreshing the root window. Default is 30 seconds. This takes effect only when
writing the map onto the root window is active (strike twice on '[' or hit the relevant box in the
Option window). Writing onto the root window is disabled by using the ']' key.
-animation
Start the animation mode right away when sunclock is launched.
-noanimation
Don't start the animation mode when sunclock is launched - this is the default. Sunclock can
anyway switch between the animation/noanimation modes by typing key ' (apostrophe) at runtime.
-animateperiod value (in seconds, between 0 and 5 sec)
Set the period for animating the map. Default is 0 seconds, which means that images are switched
as fast as sunclock can compute them. Otherwise time is shifted by the current progress value (as
set by the -progess option) after waiting the number of seconds prescribed by the animateperiod
value. This takes effect only when the animation is active (strike on the ' key or hit the
relevant box in the Option window).
-addcity size|name|latitude|longitude|timezone
where name is the ascii name of the place to be shown on the map. The first argument "size" is an
nonnegative integer meant to indicate the size of the city (1: major city, 2: important city, 3: less
important city, ...). The argument "size" can also be set to 0, with the effect of hiding the
corresponding city, while keeping in memory all of its other parameters. The city can then be shown again
with Latitude and longitude are floating point numbers representing the geographical location of the
place. Western longitudes and southern latitudes should be entered as negative numbers. timezone is the
name of the timezone that the place is in. This should be the name of a file under /usr/share/zoneinfo
(or whatever directory is used on your system), incorrect timezones cause the clock to display GMT. It is
also possible to reference a file in a directory relative to /usr/share/zoneinfo for example
Canada/Eastern instead of EST5EDT.
-city name (name|lat|lon)
Initialize program so as to display data of city 'name', respectively (name, with latitude and
longitude specified). This becomes effective only if the above mentioned city is listed in the
systemwide RC file Sunclockrc or in the user's private ~/.sunclockrc. The operating mode is set to
Coordinates mode.
-position latitude|longitude
Initialize program so as to display data of the position specified by two coordinates (in
degrees). The operating mode is set to Solar time mode. Notice that with a vertical bar | (a
blank space is also admitted instead of a |).
-addcity size|name|lat|lon|tz
Adds a city in the list of cities to be displayed on the map. They must be defined by exactly 5
parameters: size, name, latitude, longitude, timezone, in this order, with parameters being
separated by a vertical bar |. Blank characters may appear in the name if double quotes are used
to mark the group of parameters (but there shouldn't be any blank characters in the other
parameters). In the RC config file, blank characters should be replaced by the octal character 037
(i.e. Ctrl-Q Ctrl-_ within emacs).
-removecity name (name|lat|lon)
Removes name (respectively name|lat|lon) from the list of cities to be displayed. Same remarks as
above for blank characters.
-citycategories value
Specifies the maximal number of city categories: categories range from 1 (highest catgory, i.e.
major city) to some maximum number. The option -citycategories specifies that maximum number. It
can only be used at start-up, not at runtime. The default value is 5.
-spotsizes s1|s2|s3|... (0<=si<=5, 1<=i<=citycategories)
With this setting, major cities (category 1) will be represented by the symbol of size s1,
category 2 cities by the symbol off size s2, etc. The default setting is -spotsize 1|2|3|4|5.
Assigning size si=0 means that the corresponding category of cities (rank i) will not be
displayed. If there are less data than the number of city categories (5 by default), the last
given data is repeated as many times as needed, e.g. -spotsizes 2 is equivalent to -spotsizes
2|2|2|2|2. Example: specifying -spotsizes 0|2|0|3|0 will let appear only city categories 2 and 4,
but those of category 4 will appear with the symbol normally allocated to cities of category 3.
This is useful in combination with the option -sizelimits (see below).
-sizelimits w1|w2|w3|...
(wi = zoom width values, 1<=i<=citycategories) With this setting, cities of rank i=1,2,3,... will
appear if (and only if) the width of the zoomed map is at least equal to wi (as it would appear if
the Earth would be entirely displayed...) . The default is 0|580|2500|6000|12000 (no constraint
for major cities, rank 4 cities appear only if the width is at least 6000 pixels, e.g. if an
original window of width 800, say, has been applied a zoom at least equal to 7.5). Thus
-sizelimits 0 is equivalent to -sizelimits 0|0|0|0|0, -sizelimits 0|400 is equivalent to
-sizelimits 0|400|400|400|400.
-shading mode=0,1,2,3,4,5
Start sunclock with the specified shading mode. Mode 0 means that the night area is not displayed.
In higher modes, the night area is displayed, with increasingly sophisticated shading algorithms.
Mode 1 stands for no shading (i.e. just bright and dark colors are shown). Mode 2 shades the
terminator area -- the area in which the sun is partially hidden by the horizon. Mode 3 shades the
region in which there is still substantial luminosity left after sunset (depending on the
diffusion parameter below). Default is 3˚ below horizon. Mode 4 additionally represents the
luminosity values in all parts of the illuminated area. Mode 5 represents the gradient of
luminosity from the brightest area (facing the sun) to the darkest area (opposite to the sun);
this has nothing to do, though, with the actual luminosity values.
-nonight
Start sunclock with the night region not drawn. This is equivalent to -shading 0.
-night Start sunclock with the night region in plain shading mode. This is equivalent to -shading 1.
-terminator
Equivalent to -shading 2
-twilight
Equivalent to -shading 3
-luminosity
Equivalent to -shading 4
-lightgradient
Equivalent to -shading 5
-diffusion value (degrees)
Sets the amplitude of the area in which diffusion of light in the atmosphere is still sufficient
to keep some luminosity after sunset. Default is 3 degrees.
-refraction value (degrees)
Sets the value of the refraction angle for tangential sun rays at sunset. This is related to the
fact that the sun sometimes looks bigger at sunset. Changing the refraction degree slightly
affects the computation of sunrise and sunset times. Default is 0.1 degree.
-darkness value (in the range 0.0 ... 1.0)
Sets the contrast between day and night areas. A 0.0 value means that the night area will not be
distinguishable from day, while 1.0 means that it will be completely black. Default is 0.5.
-colorscale value (integer in the range 1 ... 256)
Sets the number of color subdvisions which will be in use for producing shading, that is, the
number of colors ranging from bright colors (day) to dark colors (night). Default is 16.
-meridianmode mode=0,1,2,3
Start sunclock with meridians displayed or not, according to the mode, mode=0 : no meridians,
mode=1 : meridians drawn, mode=2 : meridians drawn with labels at the bottom, mode=3 : meridians
drawn with labels at the top. The default mode is 0 (no meridians).
-parallelmode mode=0,1,2,3
Start sunclock with parallels displayed or not, according to the mode, mode=0 : no parallels,
mode=1 : parallels drawn, mode=2 : parallels drawn with labels at the left hand side, mode=3 :
parallels drawn with labels at the right hand side. The default mode is 0 (no parallels).
-meridianspacing value (degree)
Specify how many degrees (or fractions of degree) should separate meridians drawn on the map.
-parallelspacing value (degree)
Specify how many degrees (or fractions of degree) should separate parallels drawn on the map.
-citymode mode=0,1,2,3
Start sunclock with cities displayed or not, according to the mode, mode=0 : no cities, mode=1 :
cities drawn, mode=2 : cities drawn with their names, mode=3 : cities drawn with their
coordinates. The default mode is 1 (cities shown without names or coordinates).
-tropics
Start sunclock with tropics and arctic circles displayed (by default, they aren't).
-sun Start sunclock with the Sun position displayed (by default, it is).
-moon Start sunclock with the Moon position displayed (by default, it is).
-notropics -nosun -nomoon
These options just negate the above ones.
-objectmode mode=0,1,2
Mode=0 stands for no objects (Sun, Moon) at all, mode=1 for objects just drawn by their symbol,
mode=2 for objects drawn with their symbol and coordinates in decimal degrees (or degrees,
minutes, seconds, using the ˚ key switch).
-reformat
This option only produces an effect when a *.vmf file is loaded. The file is then reformatted
according to the allowed syntax and normal line length, and printed to stdout. To capture the
aoutput, one should redirect the standard output to a file (with a '> file' as usual).
-vmfcolors color1|color2|color3...
Redefine the list of colors to be used in the .vmf file. This option has no effect when loading
files with other formats. Default is NULL string (so that the default colors are loaded). The
string "|" is also considered to be a void string and can be used in the option widget to enforce
default colors back.
-vmfrange a|b|c|d
Define the range in which point coordinates (latitude, longitude) should vary in the *.vmf files,
default is -90|90|-180|180. This option can be useful in combination with -reformat to make a
linear change of coordinates in a *.vmf file.
-vmcoordformat format
Set the format for the output of double values produced via the -reformat option. The default
format is "%7.3f %8.3f" (format for latitude and longitude, respectively), unless the -vmfrange
has been modified, in which case the default becomes "%g %g" (from the POSIX rules, this stands
for 6 significant digits in any position).
-vmfflags number
Sets the flags (integer value) for a *.vmf file. Each bit is a distinct flag. The zeroth order bit
(i.e. &1) determines whether features which have their own zeroth bit set are to be drawn in clock
window mode (if the zeroth bit is not set, the feature will always be drawn). Other bits are used
to control whether given features are to be drawn or not. For instance setting -vmfflags 2 with
timezones.vmf will let the timezone regions appear, while -vmfflags 6 will also show the timezone
boundary lines. (Only bits 0, 1, 2 are currently used in timezones.vmf).
-setcolor field|color
Sets the color of a specified field in the sunclock widgets. The color can be specified as any
litteral value (red, yellow, etc..., as defined in the resource file rgb.txt), or as a 6 digit
hexadecimal value #ijklmn, or even 12 digits (for 48 bits displays!) The field can take any of the
following values (between parentheses, the meaning and default value):
clockbg (clock background color; White)
clockfg (clock foreground color; Black)
mapbg (map background color; White)
mapfg (map foreground color; Black)
menubg (menu text background color; Grey92)
menufg (menu text foreground color; Black)
buttonbg (button background color; Grey84)
buttonfg1 (button very dark border color ; Black)
buttonfg2 (button dark border color ; Grey50)
buttonfg3 (button light border color ; Grey95)
buttonfg4 (button very light border color ; White)
weak (color for disabled menu commands; Red)
clockstripbg (background color of bottom strip in clock window; Grey92)
clockstripfg (foreground color of bottom strip in clock window; Black)
mapstripbg (background color of bottom strip in map window; Grey92)
mapstripfg (foreground color of bottom strip in map window; Black)
zoombg (background color of the small monochrome map used in the zoom widget; White)
zoomfg (foreground color of the small monochrome map used in the zoom widget; Black)
optionbg (background color of option text entry; White)
optionfg (foreground color of option text entry; Black)
caret (color of text caret; SkyBlue2)
change (color for temporary changes; Brown)
choice (color for selected changes and choices; SkyBlue2)
directory (color of text indicating directory entries; Blue)
image (color of text indicating image files; Magenta)
cityname (color of text indicating city names; Red)
city0 (color of unmarked cities; Orange)
city1 (color of marked cities, main selection; Red)
city2 (color of marked cities, secondary selection; Red3)
mark1 (color of first mark; Pink1)
mark2 (color of secondary mark; Pink2)
line (color of geodesic lines; White).
meridian (color of meridians; White).
parallel (color of parallels; White).
tropic (color of Equator/Tropics/Arctic circles; White)
sun (color of Sun; Yellow)
moon (color of Moon; Khaki)
star (color of Stars; White)
root (color of Root window on which stars will be drawn; Black)
PRIVATE CONFIGURATION FILE
Users may keep a file in their home directory called ~/.sunclockrc. This file can contain specify any
number of options which are also available as command line options:
mapmode: L
language: en
city: Washington
map
mapimage: /usr/share/sunclock/earthmaps/jpeg/caida.jpg
tropics
twilight
HOW IT WORKS
sunclock calculates the position of the Sun using the algorithm in chapter 18 of:
Astronomical Formulae for Calculators by Jean Meeus, Third Edition, Richmond: Willmann-Bell, 1985.
and projects the illuminated area onto the map image by an equidistributed (latitude, longitude)
cylindrical projection. The Sun's position is calculated to better than one arc-second in accuracy.
BUGS
Sunclock makes intensive use of pointers and memory allocation/deallocation, so memory leaks might still
be possible under some circumstances. However, the program has been thoroughly debugged, and crashes
seem to be rather rare. As new features are introduced, older ones may become broken during the phase of
development :-(
The illuminated area shown is the area which would be sunlit if the Earth atmosphere would be absolutely
uniform. The actual illuminated area may depend on weather, temperature, atmospheric refraction and
diffusion, etc.
AUTHORS
John Walker, Autodesk, Inc., <kelvin@acad.uu.NET>, wrote the original Suntools program from which
sunclock is derived.
John Mackin, Basser Department of Computer Science, University of Sydney, Sydney, Australia,
<john@cs.su.oz.AU>, wrote the X11 version out of Suntools.
Stephen Martin, Fujitsu Systems Business of Canada, smartin@fujitsu.ca, added support for interactive
map.
Jean-Pierre Demailly, Université de Grenoble I, demailly@fourier.ujf-grenoble.fr worked out versions
3.xx, which add many new major features (loading maps, shading, zoom functionalities, configuration of
options on the fly at runtime, through a point and click GUI interface).
June 22, 2006 SUNCLOCK(1)