秋しゅう分ぶん点てん

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.

• 秋しゅう分ぶん点てんは、天てんの赤せき道どうと黄こう道どうが交まじわる二ふたつの点てんのうちの一ひとつです。

  The autumnal equinox point is one of the two points where the celestial equator and the ecliptic intersect.