ヘリオメーター

noun

heliometer

Astronomical instrument for measuring the sun's diameter or angular distances between celestial bodies. Also known as 太陽儀.

See also: 太陽儀

• 19世せい紀きの天てん文もん学がく者しゃはヘリオメーターを使つかって星ほしの位い置ちを精せい密みつに測そく定ていした。

  19th-century astronomers used heliometers to precisely measure stellar positions.