Why does the Yin Yang symbol look this way?
starworlds: December 2013
The arrival of the Winter Solstice at December 21, heralds the shortest day of the year in the northern hemisphere and the first official day of winter. This moment marks the end point of the contracting forces of yin and darkness, and the birth of the expansive forces of yang and light. At this time of year, the Sun appears to stand still for three days in declination, its lowest annual altitude above the horizon at noon.
Season - Wikipedia