The Lunar Mansions. A calendar/astrology scale. This is visible inside the shadow squares, center bottom.
Two views of the Arcs of the signs: Equal sized and projected(top left shows the projected view of the arcs, with the Noon lines and the Qibla lines)
These are still not ready for use(note the missing labels…), but I’m planning on finishing them for the 3.0 release later this spring.