Jisho

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しょうこうてんこうけい 昇交点黄経
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Noun
1. longitude of the ascending node​Astronomy
Wikipedia definition
2. Longitude of the ascending node​The longitude of the ascending node (☊ or Ω) is one of the orbital elements used to specify the orbit of an object in space. It is the angle from a reference direction, called the origin of longitude, to the direction of the ascending node, measured in a reference plane. Commonly used reference planes and origins of longitude include: For a geocentric orbit, Earth's equatorial plane as the reference plane, and the First Point of Aries as the origin of longitude.
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