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Astronomical coordinate systems - Wikipedia
What Are Celestial Coordinates? - Sky & Telescope
天球坐标系 - 百度百科
Celestial coordinates | Equatorial, Azimuthal & Altitude - Britannica
赤经、赤纬 | 天球 | 天球赤道 | 方位角、高度角 | RA, Dec | Star Walk
Chapter 2: Reference Systems - NASA Science
Celestial Coordinates System - A Simple Guide for Backyard …
Celestial Coordinate System - University of Rochester
Celestial Coordinates: RA, Dec, Alt, Az, Etc. - Star Walk