赤緯

喺天文學入面，赤緯係喺赤道坐標系統度將一個點定位喺天球上面嘅兩個角度之一，另一個叫赤經。赤緯角係沿著天赤道嘅北或者南，經過相關點嘅小時圓嚟測量嘅。

赤經

拎
 MEASURING THE SKY A Quick Guide to the Celestial Sphere James B. Kaler, University of Illinois
 Celestial Equatorial Coordinate System University of Nebraska-Lincoln
 Celestial Equatorial Coordinate Explorers University of Nebraska-Lincoln

Sidereal pointer (Torquetum) – to determine RA/DEC.

物理量