A sizable directory of Internet Clocks, Counters, and Countdowns.
The clock that piqued my interest was the Mars24 Sunclock on the Goddard Institute of Space Studies page.
Mars24 is a Java program and browser applet which displays a Mars “sunclock”, a graphical representation of the planet Mars showing its current sun- and nightsides, along with a numerical readout of the time in 24-hour format. Other displays include a plot showing the relative orbital positions of Mars and Earth and a diagram showing the solar angle for a given location on Mars.
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(Alternate) Time Systems — Doomsday — Miscellaneous — National Debt
Population — Sun — Planetary — Current Time — Time Lines — Countdown
Counters/Trackers — Clock, Counter, Countdown Code — Meta Clock Pages — Year 2000
(Those listed immediately above are merely section titles.)
