Word origin · etymology
Traditional English astronomical phrase.
Ascension means rising. The name preserves older right-sphere terminology, contrasted with oblique ascension.
The True Fortune Teller: historical sphere terminology ↗Merriam-Webster: right ascension ↗
How we know · epistemology
Coordinate convention
Equatorial coordinates make directions comparable once the reference frame and epoch agree. Hours and degrees describe the same angle using different units; unconverted values can create a fifteenfold error.
Connected concepts
Mentioned in 1 other entry
These links connect subjects and terminology. They do not establish a shared historical origin.
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.