บล็อก

Winter Solstice is the 22nd solar term, and the most imp0rtant one. It was set according to astronomy, called “short day (ri duan)” or “the shortest day” in ancient times. On that day, the sun reaches 270 degrees of longitude, and shines directly on the Tropic of Capricorn. The day time turns shortest on that day. The ancient people recorded their knowledge of the day in some books. In the Collection of the Seventy-two Hou, it says, “on the 15th day of the Eleventh month, the hidden qi reaches its peak.” “The Winter Solstice comes on the fifteenth day after the Major Snow. It is in the middle of the eleventh month. The yin goes comes to an end and the yang begins. The sun goes to the south. From then on, the days become longer.” (Tong Wei of Qing Dynasty)