| 单词 | absolute brightness |
| 释义 | > as lemmasabsolute brightness absolute brightness n. Astronomy the brightness of a star or other celestial object as it would be as seen from a standard distance (now usually ten parsecs); cf. absolute magnitude n. ΘΚΠ the world > the universe > star > star-matter > [noun] > brightness brightness1674 absolute brightness1832 sun power1853 luminosity1906 1832 W. Herschel in Abstr. Papers Royal Soc. 1 6 The celebrated author may mean the intrinsic brightness of a body, which applies to its surface diminished by distance, and not the absolute brightness of the whole. 1924 G. E. Hale Depths of Universe i. 13 Consider some brilliant star, such as Vega. Its brightness to the eye must depend upon two things: the total amount of light it radiates (its absolute brightness) and its distance from the earth. 1992 Astronomy May 28/1 The most accurate technique for determining distances to nearby galaxies in recent times is measuring the apparent brightnesses of Cepheid variable stars. Their precise variability and absolute brightness make them valuable and dependable ‘standard candles’. < as lemmas |
| 随便看 |
|
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。