equatorials

一种望远镜,装有两个互相垂直的运动轴,其中一个平行于地球轴,每个轴带有刻度盘,分别用于测量赤纬和赤经(或时角),使望远镜即使在白天也能指向已知赤经赤纬的星体或其他天体。

A kind of telescope mounted so as to have two axes of motion at right angles to each other, one of them parallel to the axis of the Earth, and each carrying a graduated circle, one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known.