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What Makes a ‘Supermoon’ Look Bigger and Brighter?
‘超级月亮’为何看起来更大更亮？
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A supermoon occurs when the full moon coincides with lunar perigee—the point in its elliptical orbit closest to Earth.
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Because the Moon’s orbit isn’t perfectly circular, its distance from us varies between about 363,000 km and 405,000 km.
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At perigee, the Moon appears up to 14% larger and 30% brighter than at apogee—the farthest point.
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Our eyes can’t judge absolute size without reference, so the Moon looks biggest near the horizon due to the ‘Moon illusion’.
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Photographers capture dramatic supermoons by pairing them with landmarks—trees, towers, or mountains—for scale.
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Tidal forces also strengthen during supermoons, producing higher-than-usual spring tides along coastlines.
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Ancient cultures tracked lunar cycles closely, linking supermoons to seasonal planting, fishing, and ritual timing.
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Astronomers now use precise orbital models to predict supermoons decades ahead—and warn coastal planners of amplified flooding risks.