| 单词 | apparent magnitude |
| 释义 | > as lemmasapparent magnitude apparent magnitude n. [magnitude n. 3] the magnitude of a celestial body classified according to its apparent brightness, opposed to absolute magnitude n. at absolute adj. and n. Compounds 2. ΘΚΠ the world > the universe > star > star-matter > [noun] > magnitude magnitude1580 mag1840 apparent magnitude1875 absolute magnitude1902 third magnitude1905 1875 Encycl. Brit. II. 822/1 The gathering of stars of the leading orders of apparent magnitude in the galactic zone shows that stars of many orders of real size and brightness are there gathered together. 1902 J. C. Kapteyn in Pbns. Kapteyn Astron. Lab. No. 11. p. 12 We further define the absolute magnitude (M) of a star..as the apparent magnitude which that star would have if it was transferred to a distance from the sun corresponding to a parallax of 0″·1. 1940 Chambers's Techn. Dict. 522/1 Apparent magnitude is the measure of the brightness on Pogson's logarithmic scale, in which each step of one whole magnitude represents a light ratio of 2·512, and this increases numerically with decreasing brightness. < as lemmas |
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