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| right as·cen·sion |
noun |
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| Definition: |
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arc of celestial equator: one of the two reference points in the equatorial coordinate system for specifying the position of an astronomical object on the celestial sphere. Corresponding to longitude on the Earth, it is measured in hours, minutes, and seconds eastward from the vernal equinox, the point where the ecliptic intersects the celestial equator.
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