北河三，星名。即双子座β星，意思是“拳术师”。全天第17亮星（夜晚最亮的是大犬座的天狼星），视星等1.14等，绝对星等1.09等，距离33.7光年。是颗K0IIIb型红巨星。光度为太阳的32倍。是距离我们最近的红巨星之一。
N the brightest star in the constellation Gemini, lying close to the star Castor. Visual magnitude: 1.15; spectral type: K0III; distance: 34 light years 北河三 → see also Castor
The six stars that compose the Winter Hexagon are Aldebaren, Capella, Castor (and Pollux), Procyon, Rigel, and Sirius.
组成冬季六边形的这六颗星是毕宿五、五车二、北河二(和北河三)、南河三、参宿七和天狼星。
Tonight's moon shines in front of the constellation Gemini, in the vicinity of Gemini's two brightest stars: Castor and Pollux.
今晚的月亮会在双子座的上方出现，在双子座附近有两颗特别明亮的星星——北二河和双子座星。
Castor and Pollux, the twin sons of Leda and brothers of Helen and Clytemnestra, who were transformed by Zeus into the constellation Gemini.
狄奥斯库里的：卡斯托耳与帕洛克斯，莱达的孪生儿子，海伦和克莱特姆内斯特拉的兄弟。它们被宙斯变成双子星座。
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