Jisho

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せきどうけいしゃかく 赤道傾斜角
Noun
1. axial tilt; obliquityAstronomy
Wikipedia definition
2. Axial tiltIn astronomy, axial tilt, known to astronomers as obliquity, is the angle between an object's rotational axis, and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane. It differs from orbital inclination.
Read “Axial tilt” on English Wikipedia
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