| 单词 | fourth inequality |
| 释义 | > as lemmasfourth inequality The older astronomers reckoned four inequalities, two common to planets and the moon, and two confined to the moon. first inequality: that which is due to the eccentricity of the orbit, and the acceleration of motion at a planet's perihelion or the moon's perigee. second inequality: that which arises from the obliquity of the direction of the planet's motion to the radius vector of its orbit; = evection n. 2a. third inequality: = variation n. (of the moon). fourth inequality: that due to the more rapid motion of the moon when the earth is in perihelion; also called annual inequality or annual equation. Later astronomers have discovered several others, as parallactic inequality (see quot. 18611); periodic inequality, the comparatively short recurring orbital perturbation due to the attraction of another body, as the great inequality of Jupiter and Saturn.extracted from inequalityn.< as lemmas |
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