| 单词 | astronomical unit |
| 释义 | > as lemmasastronomical unit astronomical unit n. Astronomy the mean distance between the earth and the sun (approx. 93 million miles, 150 million kilometres), used as a unit for measuring distances within the solar system; abbreviated au. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical calculation > [noun] > unit hour1777 astronomical unit1848 gravitational system1888 au1910 parsec1913 1848 Amer. Jrnl. Sci. 56 36 Farther from one another than the astronomical unit are, Iris and Pallas, Flora and Pallas, in their descending nodes. 1910 Outlook 16 July 568 We find Mercury about .4 of an astronomical unit (A. U.) from the sun. 1970 J. Blish Spock must Die! x. 76 He is a considerable distance away from the Enterprise—a minimum of two astronomical units, certainly. 2000 Sciences May 45/3 Astronomers could only guess the true radius of the earth's orbit, a value known as the astronomical unit. < as lemmas |
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