synodic period

Noun

(astronomy) The apparent orbital period of a planet as seen from Earth.

Japanese Meaning

天文学で、地球から観測した際に見かけ上の惑星の公転周期を示す。

The synodic period of Mars determines how often it appears in opposition.

火星の会合周期は、地球から見たときにどのくらいの間隔で姿を見せるかを決める。

Sense（1）

(astronomy) The apparent orbital period of a planet as seen from Earth.

synodic periods

（ plural ）