満みち欠かけ

noun

waxing and waning (of the moon)

Astronomical term for the moon's phases; used in both scientific and everyday contexts.

• 月つきの満みち欠かけは約やくにじゅ29.5日うくてん周期ごにちしゅうきで繰くり返かえされる。

  The moon's waxing and waning repeats in a cycle of about 29.5 days.