Polaris Clock

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About this app

Visualize the orientation of the Big Dipper relative to Polaris — like a clock face in the night sky. See real-time rotation of the northern sky based on your local sidereal time. Learn how ancient mariners and explorers used the stars to tell time and navigate. Input your current longitude for precise celestial positioning.

What’s new

Visualize the orientation of the Big Dipper relative to Polaris — like a clock face in the night sky. See real-time rotation of the northern sky based on your local sidereal time. Animate the Big Dipper’s movement across the night for any date and time. Learn how ancient mariners and explorers used the stars to tell time and navigate.