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The Right Ascension of a celestial sphere object is measured along the celestial equator, with the zero point being the vernal equinox or where the sun is on the first day of spring. This measurement is always in hours, minutes, and seconds. One hour equals 15 degrees because there are 24 hours in a day and the celestial sphere rotates 360 degrees in one day.
Astrological Instruments > Celestial Sphere
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