Latley l have been up to my ass in yin.

I like this. How did it come about? Put a stick in the ground -- straight up (about 6-8 feet high). Every morning and evening put a small stone where the 1st and last shadow of the stick appears. Do this for a year -- also implies flat land, not mountainous. The stones will form the Yin-Yang symbol. Draw a circle (use a string) around the whole thing. Where the stones meet the circle, it is the Winter and Summer solstices. There is a host of astronomical info on the Yin-Yang.

I've seen the sumbol a great deal, but never saw ti explained before. Thanks.