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大角,星一粒,喺同名大角星官內。大角為東方蒼龍之角。歲差之故,唔係角宿之內,而喺亢宿。史記天官書講,杓攜龍角,龍角就大角。又有講,「大角者、天王帝廷。」天王係大火,大角就係佢嘅廷。
大角一星,亦叫大角星,光星,地球望上去,視星等,負百分之四。夜天恆星之中,排第三,僅次於天狼同老人星,色燈黃。距離地球三十六光年七。
西洋星座歸入牧夫座,為其α星。因而叫牧夫座α星 (α Boo),別名守熊人,Arcturus,出自古希臘文Ἀρκτοῦρος。而佢所在牧夫座側邊,就有大熊座。
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