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恒星（こうせい、（英: fixed stars、羅: asteres aplanis）とは、自ら光を発し、その質量がもたらす重力による収縮に反する圧力を内部に持ち支えるガス体の天体の総称である。古典的な定義では、夜空に輝く星のうち、その見かけの相対位置の変化の少ないもののことを指す。地球から一番近
North Polar Distances of Eight Thousand Three Hundred and Seventy-seven Fixed Stars, Reduced to January 1, 1850: Together with Their Annual Precessions,
the Fixed Stars) of al-Sufi,late 15th century”. The Met. 2019年6月25日閲覧。 ^ “Kitab suwar al-kawakib al-thabita (Book of the Images of the Fixed Stars) of
of Macclesfield concerning an apparent motion observed in some of the fixed stars; by James Bradley D. D. F. R. S”. Philosophical Transactions of the Royal
North Polar Distances of Eight Thousand Three Hundred and Seventy-seven Fixed Stars, Reduced to January 1, 1850: Together with Their Annual Precessions,