| 单词 | polar flattening |
| 释义 | > as lemmaspolar flattening polar flattening n. Astronomy the extent to which the polar diameter of a planet is shorter than the mean equatorial diameter. ΘΚΠ the world > the universe > planet > [noun] > part of planet > polar flattening polar flattening1784 compression1820 1784 Philos. Trans. (Royal Soc.) 74 265 A little of the polar flattening is visible, so as to admit of no doubt. 1895 Astrophysical Jrnl. 2 136 Micrometric measures of the diameters of Mars..give as the most probable value for the equatorial diameter of the planet at distance unity: 9″.40 ± ·007; for the polar one: 9″.35 ± ·005; and for the polar flattening 1/ 190 of the equatorial diameter. 1954 Times 25 June 5/6 Dr. E. C. Slipher..has the task of determining accurately the diameter of Mars and the extent of its polar flattening. 2000 Isis 91 758/2 In addition, he made spectacular discoveries with a long-focus lens: the polar flattening and axial rotation of Jupiter. < as lemmas |
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