| 单词 | semidiameter |
| 例句 | Naval Observatory routinely uses 34 minutes of arc for the angle of refraction and 16 minutes of arc for the semidiameter of the sun's disc. Spring Arrives with Equinox Tuesday, Earliest in More Than a Century 2012-03-19T19:45:00.230Z This is because the half of the equatorial diameter enormously outmeasures even the greatest apparent semidiameters of the sun and of the moon, even taking as a norm the smallest horizontal parallax of the moon. The Borghesi Astronomical Clock in the Museum of History and Technology Contributions from the Museum of History and Technology, Paper 35, the Smithsonian Institution United States National Museum Bulletin 240 Suppose, for example, that looking at the moon I should say it were fifty or sixty semidiameters of the earth distant from me. A Essay Towards a New Theory of Vision |
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