It was the custom of the day to manipulate the calendar in order to pretend that 'sakutan toji' came or did not come regardless of the cycle of celestial bodies (which is called 'kaireki'). |
更に当時の風習として、「朔旦冬至」の到来や回避を行うため、天体の動きとは無関係に人為的な暦の調整(「改暦」)が行われた。 |