Astronomy. Each of the classes into which stars and other celestial objects have been placed according to their degree of brilliancy. Now regarded…

= magnitude, n. 3a.

the magnitude of a celestial body classified according to its apparent brightness, opposed to absolute magnitude n. at absolute, adj. n.compounds 2.

the magnitude of a star or other celestial object as it would be as observed from a standard distance of ten parsecs; cf. apparent magnitude n. at app…