| 单词 | polar diameter |
| 释义 | > as lemmaspolar diameter polar diameter n. Astronomy the diameter of a planet measured from pole to pole. ΚΠ 1694 Philos. Trans. (Royal Soc.) 18 253 Mr. Newton has shown that his [sc. Jupiter's] Polar Diameter is to that of his Equinoctial as 40 to 41 nearly. 1738 W. Deane Descr. Copernican Syst. 18 The Polar Diameter, or Axis, is to the Equatorial one, as 689 to 692. 1815 J. Smith Panorama Sci. & Art I. 277 The polar diameter of the earth. 1970 Jrnl. Brit. Astron. Assoc. 80 179 If ε is the amount of flattening, a is the equatorial diameter and b the polar diameter, then ε = 1 − b/a. < 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。