noun
autumnal equinox point
Astronomical term for the point on the celestial sphere where the sun crosses the celestial equator moving southward, marking the beginning of autumn in the Northern Hemisphere.
秋分点は、天の赤道と黄道が交わる二つの点のうちの一つです。
The autumnal equinox point is one of the two points where the celestial equator and the ecliptic intersect.
Compound of 秋分 (shūbun, 'autumnal equinox') + 点 (ten, 'point'). The term is a direct calque from Western astronomy.