The Chinese ancestors were more inspired at mathematics. They invented a "leap month," a system which inserted an extra month once every three years to rectify the disparity between the solar and lunar calendars.
中國老祖宗，數學比較靈光，想出三年一閏（每三年要多一個月）、十九年七閏的算法，補足了陰曆和陽曆間的日差。