Word origin · etymology
Geometric phrase.
Parallel comes from Greek language for being beside one another; of declination specifies the coordinate being matched.
How we know · epistemology
Equatorial angular criterion
The comparison uses matching declinations within a stated tolerance. It is not a zodiac-longitude conjunction; any analogous interpretation is a school’s choice rather than a consequence of coordinate equality.
Connected concepts
Terms used in this explanation
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.