実じっ視し等とう級きゅう

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Meanings

1

noun

apparent magnitude

Technical term in astronomy for the brightness of a celestial object as seen from Earth, without correction for distance.

reality, truth, seed

視inspection, regard as, see

等etc., and so forth, class (first)

級class, rank, grade

絶ぜっ対たい等とう級きゅう
絶対等級 (absolute magnitude) is the intrinsic brightness of a celestial object at a standard distance, while 実視等級 is the brightness as observed from Earth.

Compound of 実視 (actual observation) and 等級 (grade, magnitude). The term is a direct translation of the English 'apparent magnitude'.