子し午ご環かん

noun

meridian circle; transit circle

A specialized astronomical instrument used to measure the positions of celestial objects as they cross the meridian.

• 子し午ご環かんは天てん体たいの位い置ちを精せい密みつに測そく定ていするために使つかわれる。

  The meridian circle is used to precisely measure the positions of celestial bodies.