Set the Sky

Pick a level, read the request and turn the dial until the sky matches. There is no timer and no daily limit: play as many rounds as you like.

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The instruments are simplified models. The Moon’s orbit is drawn as a circle, the eclipse shadows come from average sizes and distances, the Orbit Dial uses the geometric horizon (real sunrise and sunset tables add about 50 arcminutes), and the Rise & Set Dial describes one place at 40 degrees north near the equinox. A match counts inside a window. The game teaches how the cycles work. It does not calculate exact times or dates. ahhoh.com explains the sky with simplified models. For exact times and dates, use official tables.