What do you mean by breaking the sun?

Breaking the sun is one of the twelve names. These twelve names were originally symbols for accurately recording dates in ancient times, but later generations used them as symbols of good luck or bad luck. Breaking the sun means an unlucky day. See (Qing Dynasty) Yun Lu. Interpret notes and texts. Volume ten. Broken sun: "Those who break the sun should seek medical treatment and break houses and walls. Seize all the rest time. " The Eleventh Chapter, a gossip with negative exposure, said, "Yin Biyou opened the imperial calendar, found a broken day, and made an appointment with several companions to go directly to Nanjing. 」