In 2015 the spring time

Calendar: on March 21, 2015, lunar month early Saturday

In ancient China, the spring equinox is divided into three

A bird to hou yuan;

2 HouLei is voice;

Three hou electricity.

Three hou is said after the spring equinox, the swallow then flew in from the south,It rainsThe sky was thunder and lightning.The vernal equinox recorded in Chinese ancient calendar for: "three days before the vernal equinox, the sun into the equator".

The vernal equinox origin

The vernal equinox from every year on March 20, 21 (or) to April 4 (or 5) end.The vernal equinox, the Gregorian calendar every year on March 20 or 21, the sun reaches 0 degrees longitude, vernal equinox.The day the average length of day and night, just as the spring ninety, half of so called "vernal equinox".

The vernal equinox this day direct sunlight on the equator, day and night almost equal, then position of direct sunlight gradually moved to start the nights are short.The vernal equinox is a more important solar term, it not only has the meaning of in astronomy: north and south hemispheres equinox;On the climate, there are obvious characteristics of the spring equinox season, except for the qinghai-tibet plateau in China north, northeast, northwest and north China region outside into the beautiful spring, in the vast land, willow green, apr, jointing stage of wheat, rape flowers.

"Pulled seventy-two hou set solution" : "(a summer) in February, points half also, when half of the ninety - day, so the call.In the autumn of synonymy.Han dong "sections about chun-qiu theory? Yin and Yang in up and down" : "as for the month of spring, in the sun in the east, Yin in illicit affair, of the vernal equinox.Half is the vernal equinox, the Yin and Yang, reason both night and day and year."