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The Great Comet of 1556 is a famous comet that first appeared in February 1556. The Great Comet of 1556, known as C/1556 D1 in modern nomenclature, appears to have been seen in some places before the end of February; but it was not generally observed until the middle of the first week in March. Its apparent diameter was equal to half that of the Moon, and the tail resembled " the flame of a torch agitated by the wind,"—an expression doubtless referring to the coruscation which are sometimes visible in the tails of comets. Cornelius Gemma (the son of Gemma Frisius) says, the head of the comet, when it first appeared, was fully as large as Jupiter; its color resembled that of Mars.〔 The course of the comet of 1556 was observed by Paul Fabricius, a mathematician and physician at the court of Charles V, Holy Roman Emperor.〔 == Charles V comet == The Great Comet of 1556 is called the comet of Charles V. When the Emperor first caught sight of it he stood aghast, and exclaimed: "By this dread sign my fates do summon me". Charles had long meditated about retiring from the world he had conquered and crushed. Regarding the comet as a sign of Heaven's command to do so, he hastened towards the peaceful monastery of St. Juste, Placentia.〔 An English treatise (anonymous) on "''Blazing Stares''" (1618) speaks of the comet as follows : 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Great Comet of 1556」の詳細全文を読む スポンサード リンク
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