But if we want to be more specific, it depends on which calendar system in use. Most of us use the Gregorian system which is accepted internationally. Many people think Chinese use the lunar system only. The beginning of each period is identified by a name corresponding to the position of the sun. At this time the sun is at the southmost.
People expect the sun to come back.
To celebrate, warm soups of ginger and wheat-balls are served. At this time the sun is exactly at the equator. No celebration is held. It is supposed to be sunny but not too hot. People go to clean graveyards which otherwise will be covered by grass.