- hour angle system of coordinate
- 时角: hour angle
- 斜角坐标系: oblique axes; oblique coordinate system; oblique coordinates system
- 直角坐标系: cartesian axes; rectangular coordinate system; system of rectangular coordinates; the cartesian coordinate system
- 直角坐标系统: rectangular coordinate system
- 赤道直角坐标系: equatorial system of coordinates
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