Planet’s Visibility presents a 3-color graph that shows when a planet, the moon or the sun is visible during any year from 3000 BC to AD 6000 at any location on the earth. The vertical axis marks the months of the year, the horizontal axis marks the......
Play Mahjongg Solitaire in 12 unique ways. You choose how to play the game. There are regular modes with classic rules but also new modes where you can do things like invert columns, match doubles right away, Zap out tiles, or test your memory. This......
Almanac gives you the capability to determine the times of rising, setting, and meridian transit for the sun, the moon, and the planets. It also enables you to calculate the beginning and ending of astronomical, nautical, and civil twilight. The resu......
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