n. 1.(日晷的)晷针，指时针。 2.【数学】磬折形〔自平行四边形的一角截去一较小平行四边形后的图形〕。
indicator provided by the stationary arm whose shadow indicates the time on the sundial
The gnomon is the part of a sundial that casts the shadow. Gnomon (γν?μων) is an ancient Greek word meaning "indicator", "one who discerns," or "that which reveals.
例句与用法
1.
In all cases the gnomon lies in the plane of the meridian . 表始终都处于子午面内。
2.
A stake used for this purpose was the earliest type of sundial and was called a gnomon . 这种特定的标杆就是最早的一种日晷仪，人们称之为日晷仪标杆。
3.
It appears as a small gnomon with lines extending in each major direction ( along the x , y , and zaxis ) 它看起来象是一个小的指时针和在每个主要的轴向上（ x ， y ， z轴）的线的延伸。
4.
From then on , people were able to measure time and determine seasons based on the position and length of the gnomon ' s shadow 从此，人们便通过观测圭表上日影的长短变化来计算时间、测定季节。
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