Spring begins (立春) is an old Chinese idiom for describing the date of the beginning of spring in a year. The spring begins of 2009 is Feb 4th, and it's today. In the ancient China, people calculated some days for dividing four seasons based solar moving. They were sping begins, summer begins, autumn begins and winter begins respectively. At the middle of every two seasons, there were another four days to describe them which were spring equinox, autumn equinox, summer solstice and winter solstice. For conducting argricaltural production more effective, Chinese people calculated another sixteen days to mark different climate. Consequently, there were 24 different days for 24 different climate in a whole year. These days were called The 24 Solar Terms

      Spring begins happens when the sun move at the celestial longtitude 315° and is a day among Feb 2nd to Feb 5th annually.  The formula for computing this day is [Y * D + C] - L. Y is the last two number of the year, D is a constant 0.2442, and L is the amount of the leap year. At last C equals to 3.87 in 21 century and equals to 4.15 in next century. For example, the date of spring begins of 2058 is Feb 3rd because [58×.0.2422+3.87]-[(58-1)/4]=17-14=3.

      In this day, Chinese people used to eat pastry and chew carrot so spring begins called “biting spring” also. This day means the beginning of the annual argricaltural activities, so the farmers will become busy from now. Same to crop, our bodies also start a new round growth from this day and are prone to be weak and sick more because weather become warmer and various virus start to propagate. Therefore, we should  keep us warm against variable weather and open the windows in the room frequently for circulating air. In addition we should enhance immunity of ourselves by physical exercising.