The instrument which is employed to directly measure the tri-stimulus coordinates of a color is known as a colorimeter . 用来直接测定颜色三刺激值座标的仪器叫做色度计。
An input device that provides coordinates of a position . example : a mouse , a tablet 提供位置座标的一种输入设备。例如鼠标器、图形输入板。
We will talk more about the celestial sphere and how to tell the positions of the stars in the sky . we will also introduce the constellations and the star atlas 在这一章,我们会探讨天球及天球座标的种种,然后再介绍星座及星图。
Declination of a planet is his distance from the equator , and as he declines from thence either northward or southward , so is his declination nominated either north or south 星体以赤道为座标的纬度。同样地,观测星体落在赤道南边或北边,以及如何运行。