月げっ相そうげっそうMeanings1nounlunar phase; phase of the MoonastronomyTechnical astronomy term for the changing appearance of the Moon as seen from Earth.月げっそ相うはやくには約じゅうく29.5日てんご周期にちしゅうきで変へん化かする。The lunar phase changes in a cycle of about 29.5 days.
