 cycle in the <i>s&#236;f&#275;n</i> system. The other solar terms can be calculated using equation (5) on the <a href="guliuli.html#computation">ancient six calendars page</a>:<br />
JD<sub>q</sub>(j, y) = JD(W(y)) + (j/24)&middot;P<sub>s</sub> &nbsp;&nbsp;&nbsp;&nbsp;(2)<br />
Here j is the solar-term number counting from the winter solstice, with j=0 for the winter solstice (Z11), j=1 for J12, j=2 for Z12, j=3 for J1, ..., j=23 for J11. With the exception of the winter solstice being in late December in 