春しゅん分ぶん点てん

noun

vernal equinox point; vernal equinox

Astronomical term for the point on the celestial sphere where the sun crosses the celestial equator from south to north, marking the beginning of spring in the Northern Hemisphere.

• 春しゅん分ぶん点てんは、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 vernal equinox point is one of the two points where the celestial equator and the ecliptic intersect.

• 太たい陽ようが春しゅん分ぶん点てんを通つう過かすると、昼ひると夜よるの長ながさがほぼ等ひとしくなります。

  When the sun passes the vernal equinox point, day and night become nearly equal in length.