| 单词 | light-time |
| 释义 | > as lemmaslight-time light-time n. Astronomy the time taken by light to travel a specified distance, esp. from a celestial object to the earth.Cf. Compounds 2, light year n. 1. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > emission of light, radiation > [noun] > speed of light > time taken light-time1900 1900 Observatory 23 449 It may be observed that this light-time is only wanted with a slight degree of accuracy. 1920 A. S. Eddington Space, Time & Gravitation 12 But then you must know the speed of the earth through the aether. It may have shortened the light-time by going some way to meet the light coming from Arcturus. 2006 J. Daintith & W. Gould Facts on File Dict. Astron. (ed. 5) 265/1 The light-time along the mean distance between Sun and Earth is 499 seconds. < as lemmas |
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