下か合ごう

noun

inferior conjunction

Astronomical term for when an inner planet (Mercury or Venus) passes between Earth and the Sun. Contrasts with 内合 (ないごう), which is a near-synonym sometimes used interchangeably.

See also: 内合

• 金きん星せいの下か合ごうは、太たい陽ようの手て前まえを通つう過かする現げん象しょうです。

  An inferior conjunction of Venus is a phenomenon where it passes in front of the Sun.