r Epoch</a><ol type="i"><li><a href="Shangyuan.html#description">General Description</a></li><li><a href="Shangyuan.html#equations">Congruence Equations</a></li><li><a href="Shangyuan.html#conditions">Conditions for the Existence of a Solution</a></li><li><a href="Shangyuan.html#yanji"><i>Y&#462;nj&#236;</i> Algorithm (演 紀 術)</a></li></ol></li><li><a href="Shangyuan.html#constants">Adjustment of Astronomical Constants</a></li><li><a href="Shangyuan.html#abolishment">Abolishment of the Superior Epoch</