朔さく望ぼう

noun

new moon and full moon; first and fifteenth days of the lunar month

Refers to the two key lunar phases: the new moon (朔) and the full moon (望), traditionally marking the 1st and 15th days of the lunar month.

• 旧きゅう暦れきでは、朔さく望ぼうを基き準じゅんに日ひ付づけが決きめられていた。

  In the old lunar calendar, dates were determined based on the new moon and full moon.

noun

syzygy

Astronomical term for the alignment of three celestial bodies, especially the sun, earth, and moon at new or full moon.

• 朔さく望ぼうは、太たい陽よう・地ち球きゅう・月つきが一いっ直ちょく線せんに並ならぶ現げん象しょうを指さす天てん文もん学がくの用よう語ごだ。

  Syzygy is an astronomical term for the phenomenon where the sun, earth, and moon align in a straight line.