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Constellations move measurably over long timespans. All the stars that make up constellations are in the Milky Way, and the rotation of objects within the Milky Way effects the shape of the constellations. Halley first noticed this effect with several very close stars when comparing ancient Greek charts to his own.
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[–] usul ago
Constellations move measurably over long timespans. All the stars that make up constellations are in the Milky Way, and the rotation of objects within the Milky Way effects the shape of the constellations. Halley first noticed this effect with several very close stars when comparing ancient Greek charts to his own.