Projects Ideas

Make a Star Clock!

ALong before the invention of clocks and watches, skywatchers knew that the motion of the stars marked the passage of time during the night. As Earth turns on its axis, the stars appear to rise in the east and set in the west, just as the Sun and Moon do. Looking up in the northern sky, however, the stars do not rise or set — instead, they seem to slowly turn counterclockwise around Polaris, the North Star.

Our Star Clock combines this nightly pinwheel motion around Polaris with the seasonal position of the two familiar star patterns — the Big Dipper and the "W" of the constellation Cassiopeia — to find the time in a simple and fun way.

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