solar equation table 日躔表
Solar visual orbit equation 太阳视轨道方程
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The solar equation table of the Dayan Calendar is a mathematical table of equally quartic difference, and it reflects Yi Xing's profound understanding about the solar motion.
《大衍历》日躔表是一份四次差分相等的数表，反映一行对太阳运动复杂性的深刻认识。
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Equation of Time function at 9:00 that indicates the difference between solar time and real time.
FORBES: Experience Time And The Art Of Watchmaking For Yourself
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