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单词 Circumpolar star
释义

Circumpolar star

中文百科

拱极星

北极星和拱极星周日视动轨迹（固定摄影拍摄）
La estrella Polar y estrellas circumpolares en una fotografía con lenta velocidad de obturación. Note que las estrellas cercanas al polo celeste hacen un trazo menor.
The northern circumpolar stars revolving around the north celestial pole. Note that Polaris, the bright star near the center, is almost stationary. Polaris is circumpolar and can be seen at all times of the year in the northern hemisphere. (The graphic shows how the apparent positions of the stars move over a 24-hour period, but in practice they are not visible when the Sun is also in the sky.)
The North Star and circumpolar stars in a photograph with a long shutter speed of several hours. Note that the stars near the celestial pole make less of a trail with the long exposure.

拱极星，是指在天球中，其赤道座标系统的座标较观察者所在纬度高的恒星。由于地球自转的关系，使夜空看似也在转动，而拱极星永远不会落入地平圈下。

例如，在地球北极或南极的观测者，所看见的恒星都是拱极星（因为所有天体皆围绕天极转动而永不落下）；在赤道上的观测者则看不见任何一颗星是拱极星，因为两个天极皆紧贴在地平在线。在不同的地理纬度上，会使在接近天极的一部分恒星为拱极星，视乎观测者身处之半球与纬度高低而定。

有些天文学家将距离天球赤道55°以上的恒星定义为拱极星，也就是在赤纬55°至90°之间天体是拱极星。换言之，拱极星是在南、北天极周围35°以内的天体。

英语百科

Circumpolar star 拱极星

The northern circumpolar stars revolving around the north celestial pole. Note that Polaris, the bright star near the center, is almost stationary. Polaris is circumpolar and can be seen at all times of the year in the northern hemisphere. (The graphic shows how the apparent positions of the stars move over a 24-hour period, but in practice they are not visible when the Sun is also in the sky.)
The North Star and circumpolar stars in a photograph with a long shutter speed of several hours. Note that the stars near the celestial pole make less of a trail with the long exposure.
北极星和拱极星周日视动轨迹（固定摄影拍摄）
La estrella Polar y estrellas circumpolares en una fotografía con lenta velocidad de obturación. Note que las estrellas cercanas al polo celeste hacen un trazo menor.

A circumpolar star is a star that, as viewed from a given latitude on Earth, never sets (that is, never disappears below the horizon), due to its proximity to one of the celestial poles. Circumpolar stars are therefore visible from said location toward nearest pole for the entire night on every night of the year (and would be continuously visible throughout the day too, were they not overwhelmed by the Sun's glare).
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更新时间：2025/6/27 9:40:45