gnomon

用于通过太阳阴影报时的物体,如柱子或杆子,尤指日晷的指针。

An object such as a pillar or a rod that is used to tell time by the shadow it casts when the sun shines on it, especially the pointer on a sundial.

用于观测者计算太阳子午线高度以确定纬度的物体,如柱子。

An object such as a pillar used by an observer to calculate the meridian altitude of the sun (that is, the altitude of the sun when it reaches the observer's meridian), for the purpose of determining the observer's latitude.

地球仪时圈上的刻度指示器。

The index of the hour circle of a globe.

从一个较大平行四边形的一个角上移除一个平行四边形所形成的平面图形。

A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.