Star trail photography reveals the rotation of the Earth in a way nothing else quite does. Set your camera on a tripod, point it toward Polaris, and take a long exposure — or stack hundreds of shorter ones — and you will see perfect arcs tracing the night sky’s apparent motion.
The closer to Polaris, the tighter the arc. Stars near the celestial equator trace the longest sweeping curves. The result is both a photograph and a diagram of our planet’s movement through space.
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