Geometric Perspective The images below (background spot-cleaned) come from a rather obscure 16th century anonymous paper manuscript containing sketches of geometric solids. The illustrations have been cropped from the slightly larger full-page layouts.
2014 lunar calendar: interesting formation... I wonder if the small spike at the top occurs because our calender has changed. I wonder if we mapped out the lunar calender based on the old orthodox, or Chinese calender would it be different. If it is not then what does that little spike signify?