What does Unitary Day mean?

The method of recording days in the old yellow calendar can be found in the perpetual calendar. There are two ways to solve Geng Xin Shen Youli's problem: First, it refers to the sky with the words Geng Xin Shen Youli. For example, August 14 is Geng Day, June 15 is Xin Day, June 18 is Shen Day, June 19 is You Day, June 24th is Geng Day, June 25th is Xin Day, June 30th is Shen Day, and June 30th is June 30th. Secondly, it means that it must be the sun in the heart of Geng Shen and it will cycle every 60 days. The most recent one is Gengshen Day on September 23rd and Hearty Day on 24th in the solar calendar. Appears in hexagrams with a specific meaning.