天てん頂ちょう距きょ離り

noun

zenith distance

Astronomical term: the angular distance of a celestial body from the zenith, measured along the great circle passing through the body and the zenith.

• 天てん頂ちょう距きょ離りが小ちいさいほど、天てん体たいは頭あたまの真ま上うえに近ちかい。

  The smaller the zenith distance, the closer the celestial body is to directly overhead.

• 観かん測そくした星