近きん点てん月げつ

き

ん

て

ん

げ

つ

Meanings

1

noun

anomalistic month

Astronomical term: the time it takes the Moon to go from perigee to perigee, about 27.55 days. Used in technical contexts.

点spot, point, mark

月month, moon

朔さく望ぼう月げつ
朔望月 (synodic month) is the cycle of lunar phases (about 29.53 days), while 近点月 is based on the Moon's orbit relative to perigee.
恒こう星せい月げつ
恒星月 (sidereal month) is the time relative to the fixed stars (about 27.32 days), slightly shorter than the anomalistic month.

Compound of 近点 (perigee) + 月 (month). The exact historical derivation is uncertain, but the term is a modern astronomical calque.