至し日じつ

noun

solstice day

Technical astronomical term for the day of a solstice (summer or winter). In everyday contexts, 夏至 (げし) or 冬至 (とうじ) are more common.

• 至し日じつは、太たい陽ようの赤せき緯いが最さい大だいまたは最さい小しょうになる日ひです。

  The solstice day is the day when the sun's declination reaches its maximum or minimum.