Right Ascension is measured along which coordinate or circle, with the endpoint at the vernal equinox?

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Multiple Choice

Right Ascension is measured along which coordinate or circle, with the endpoint at the vernal equinox?

Explanation:
Right Ascension uses the celestial equator as its reference circle. It’s like longitude on the sky, measured eastward from the vernal equinox, which serves as 0 hours (0°). The celestial equator is the projection of Earth’s equator onto the celestial sphere, so all RA values run along that circle from the vernal equinox onward. Circles like the horizon or prime vertical relate to local altitude and azimuth, not to how RA is defined. So the best answer is the celestial equator.

Right Ascension uses the celestial equator as its reference circle. It’s like longitude on the sky, measured eastward from the vernal equinox, which serves as 0 hours (0°). The celestial equator is the projection of Earth’s equator onto the celestial sphere, so all RA values run along that circle from the vernal equinox onward. Circles like the horizon or prime vertical relate to local altitude and azimuth, not to how RA is defined. So the best answer is the celestial equator.

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