Tham khảo Tiến động trục quay

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↑ Susan Milbrath, "Just How Precise is Maya Astronomy?", Institute of Maya Studies newsletter, December 2007.
↑ Government of India (1955), Report of the Calendar Reform Committee (PDF), Council of Scientific and Industrial Research, tr. 262, The longitudes of the first point of Aries, according to the two schools therefore differ by 23°[51]′ (–) 19°11′ ... [Upper limit was increased by 42′ of accumulated precession 1950–2000.]
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↑ Al-Battani. “Zij Al-Sabi'”. Bản gốc lưu trữ ngày 5 tháng 1 năm 2017. Truy cập ngày 30 tháng 9 năm 2017.
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