赤經
喺天文學入面，赤經（粵拼：cek3 ging1，Right ascension；符號α）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。
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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
- Merrifield, Michael. "(α,δ) – Right Ascension & Declination". Sixty Symbols. Brady Haran for the University of Nottingham.
- Sidereal pointer (Torquetum) – to determine RA/DEC.
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