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A celestial coordinate measured in hours rather than degrees.
Also known as: RA notation, Celestial longitude
Right ascension is the celestial equivalent of longitude, but it is measured in hours, minutes and seconds rather than degrees. The reason is practical: the sky turns fifteen degrees an hour, so a coordinate in hours tells an observer directly when an object will cross the meridian.
Gives a celestial object's east-west position along the celestial equator, measured in hours, minutes and seconds.
Contexts: Technical drawing, Maps
Is measured in time units because the sky rotates fifteen degrees an hour, so the coordinate states directly when an object will be highest.
Contexts: Technical drawing, Maps
A numeral with a superscript h, a second with a superscript m and a third with a superscript s.