The solarequation 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。
2
Technological improvements are needed so that wind, solar and hydrogen can be more feasible parts of the energy equation.
需要改进技术，提高风能、太阳能和氢能在能源等式中的可行性。
3
Computer calculations have been made on the dimensional solution to the anisotropic diffusion convection equation for solar cosmic rays propagating in an uniform and unbounded interplanetary medium.