Earth sun Dynamics and NBI

An excel dataset that comprises four Earth cycles:Sun meridian DeclinationThe Equation of TimeEarth's rotational speed based on the Length of the Solar DayThe daily path of the subsolar point across longitude For every given cycle, the time derivatives are also assessed for each day of a Gregorian year. Including velocity, acceleration, jerk, and snap for the cycles ONE and TWO. As the cycles THREE and FOUR arise as speeds, , their derivatives only involve acceleration, jerk and snap.The names of the variables, the units, and the formulae utilized to generate the records are provided in a separated sheet within the same document

本Excel数据集包含四类地球周期相关数据：太阳子午赤纬（Sun meridian Declination）、均时差（Equation of Time）、基于太阳日长度的地球自转速率（Earth's rotational speed based on the Length of the Solar Day），以及日下点沿经度的每日移动路径（daily path of the subsolar point across longitude）。
针对每一类周期，本数据集同时计算了公历年度内每日的时间导数。其中周期一与周期二涵盖速度、加速度、加加速度（jerk）与加加加速度（snap）四类导数；而周期三与周期四为速率类变量，其时间导数仅包含加速度、加加速度与加加加速度。
变量名称、计量单位及用于生成数据集记录的计算公式，均收录于本文件内的单独工作表中。