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arXiv 1106.2201astro-ph.IM
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日落和太阳直径测量

Sunsets and solar diameter measurement

Costantino Sigismondi

摘要:

海面上的日落提供了计时太阳穿越地平线的可能性。太阳垂直直径与日落的持续时间、方位角的余弦和观测点纬度的余弦成正比。同样的公式适用于每一个等高的圆,在阿拉伯语中称为almucantarat,它被利用在测量太阳直径与丹戎的太阳星盘。文中还提出了日落观测与星盘观测之间的类比关系,说明了这些方法的优点和误差来源。

英文摘要:

A sunset over the sea surface offers the possibility to chronometrate a solar transit across the horizon. The vertical solar diameter is proportional to the duration of the sunset, the cosine of the azimuth and the cosine of the latitude of the observing site. The same formula applies to every circle of equal height, called in arabic almucantarat, and it is exploited in the measurements of the solar diameter made with the Danjon's solar astrolabes. The analogies between sunsets and astrolabes observations are presented, showing advantages and sources of errors of these methods of solar astrometry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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