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木星者,古曰歲星。復曰福星。以其周天十二年,與地支同,因以計年故。西洋人謂之朱庇特,乃天神也,亦居神之首。是行星之於太陽系去日之列次第五。其上雲霧充盈,無陸無海,人常謂之「下無立錐之地」。南半球有大紅斑,經百年不散。有光環,甚小。有衛星眾,最大者四,曰艾奧、曰歐羅巴、曰蓋尼米德、曰卡利斯托,合稱伽利略衛星。
歲星行天,十二年而周之。古人因以紀年。是為歲星紀年。泰西學人測,木星周天為十一年有餘,不足十二年。至唐每經矯正。天文代號:。
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