Calendar - Kaikaireki

Japanese: 回回暦 - かいかいれき
Calendar - Kaikaireki
An Arabic astronomical book introduced to China during the Yuan and Ming dynasties. Arabic astronomy was introduced in the early Yuan dynasty, and its calendar system helped to correct the calculations of the ancient Chinese calendar. It is said to have been created with reference to the Irkhan Astronomical Tables compiled at the Great Observatory built by Hulagu Khan in Iran.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
元・明代の頃,中国に伝来したアラビア天文書。元の初期,アラビア天文学が伝わり,その暦法が中国古来の暦の計算の是正に役立った。フラグ・カンによってイランに建てられた大天文台で編まれた『イルカン天文表』を参考につくられたものといわれる。

出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報

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