Assertion: autumnal equinox | /r/HasProperty | astronomical event
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text: Hipparchus measured the longitude of bright stars, Spica and Regulus in the constellation Leo among others, and when he compared the data to measurements of his predecessors, he found that Spica had moved 2° relative to the autumnal equinox (astronomical event around September 22 when the tilt of the earth's axis is ...