From where is the right ascension of the body measured?

Answer 1

Right Ascension is the 'longitude' of celestial objects. The celestial 'Prime Meridian' ... the position

defined as zero RA is the celestial meridian that passes through the Vernal Equinox, and the Right

Ascension of every point in the sky is measured westward from there. It's expressed in terms of

hours, minutes, and decimal seconds, where 1 hour corresponds to 15 degrees of angle. Notice

that unlike terrestrial longitude, Right Ascension isn't measured in both directions from the zero

meridian. There's no east or west Right Ascension, only one number, that ranges from zero through

24 hours.

Answer 2

The usual units are hours, minutes and seconds.

Answer 3

Units of time: hours, minutes and seconds, to make it correspond to the rotation of the Earth (the sky thus rotates approximately by a right asencion of "1 hour" during a time of one hour).

Answer 4

Hours, Minutes, and Seconds