l constants to match the superior epoch.</p><br><sect id="constants">Adjustment of Astronomical Constants</sect><p>As seen above, the computation of superior epoch only involves the sexagenary year and day cycle, tropical year and synodic month. The superior epoch is also supposed to be the time origin of the other cycles, but those cycles are not involved in the calculation. So there are mismatches between the observation data and the computed superior epoch. To remove the discrepancies, we need to adjust 