What day does the broken day in the old yellow calendar refer to and how to calculate it?

An unlucky day in the old calendar. 2 1 day breaks the sun every year. (Lunar calendar), namely: 65438+ 10/3; February 1 1 day; The ninth day of March; The seventh day of April; The fifth day of May; The third day of June; July 1 day, 29th; August 27; September 25; 65438+1October 23rd; 165438+1October 2 1 day; 65438+February 19; Also: (beginning of spring, Changxia, beginning of autumn, beginning of winter) The day before was four miles away; The previous day (vernal equinox, autumnal equinox, summer solstice, winter solstice) was the four wonders. Note: Business, tourism and catering should avoid this day.