十万个为什么·科学阅读30篇（2）
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Why Do We See Static Stars But Feel Earth’s Rotation?
我们看到的星星是静止的，却感受不到地球自转？
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Earth rotates smoothly at about 1670 km/h at the equator, but we don’t feel motion because it’s constant.
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Our inner ears detect acceleration — not steady speed — so uniform rotation feels like stillness.
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Stars appear fixed because they’re so far away that their apparent movement across the sky is extremely slow.
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In reality, Earth’s spin makes stars rise and set, just like the Sun, completing a cycle every 23h56m.
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Long-exposure photos reveal star trails — curved arcs proving Earth’s rotation during the exposure.
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The Coriolis effect, caused by rotation, deflects winds and ocean currents but isn’t noticeable in daily life.
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A Foucault pendulum swings in a fixed plane while Earth turns beneath it, visibly demonstrating rotation.
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We only notice Earth’s motion indirectly — through day/night cycles, seasons, and celestial patterns.
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Our brains evolved to sense local changes, not planetary-scale inertia or cosmic distances.
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That contrast between stillness and motion highlights how perception depends on scale and reference frame.