| 单词 | parallactic ellipse |
| 释义 | > as lemmasparallactic ellipse parallactic ellipse n. an elliptic curve traced by the apparent position of a star as a result of the observer's motion as the earth moves around the sun. ΚΠ 1826 Philos. Trans. (Royal Soc.) 116 272 It is obvious then that a will represent the major semi-axis of the star's parallactic ellipse, and a. sin. λ the minor. 1871 J. F. W. Herschel Familiar Lect. Sci. Subj. v. 203 Each of them, microscopically watched, appears to describe the same minute annual parallactic ellipse. 1978 J. M. Pasachoff & M. L. Kutner University Astron. iii. 50 For a star that is far from the plane of the earth's orbit..the parallactic ellipse will be almost a circle. < as lemmas |
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