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：2025/12/01
first point of Libra
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(astronomy) A point on the celestial sphere where the sun crosses the celestial equator on September equinox.
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first point of Libra
During the conference, the astronomer emphasized that the first point of Libra remains the standard reference for measuring celestial longitude.
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During the conference, the astronomer emphasized that the first point of Libra remains the standard reference for measuring celestial longitude.
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