Sunclock is a sophisticated clock for the X Window system. Sunclock is based on an earlier version by John Mackin, itself derived from the Suntools program by John Walker. Many possibilities of the original astronomy routines are now exploited.
Sunclock displays a map of the Earth and shows which portion is illuminated by the sun. It 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: local time of cities, Sun and Moon position, etc.
A customizable list of cities is loaded by sunclock at start-up (and can be modified interactively, as well). Using the information provided for these cities, the map window can operate in five different modes:
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