赤經

喺天文學入面，赤經係天文學用喺天球赤道座標系統度嘅座標值之一，通過天球兩極同天赤道垂直，另一個座標值係赤緯。

赤緯

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 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