Rokuyo was originally used as a unit for distinguishing each day by stars, where one month (calendar) (≒30 days) was divided into five equal parts and six days were regarded as a cycle (30÷5= 6). 六曜は元々は、1箇月 (暦)(≒30日)を5等分して6日を一定の周期とし(30÷5 6)、それぞれの日を星毎に区別する為の単位として使われた。 |