2005/06/12 | 视差[Parallax]
类别(¤〖天文〗) | 评论(0) | 阅读(41) | 发表于 13:11
The apparent angular displacement of an object (especially a star) due the motion of the Earth in its orbit. Barnard's star has the largest proper motion known, 10.27" a year. Bessel was the first to measure a star's parallax, thus obtaining the first direct measurement the distance to a star.
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