Solstice Calendar Observatory

Many holidays are based around the solstices and equinoxes. If you celebrate any of these holidays, you might want to get in touch with some of the ancient ways of tracking the Sun. This thing is a script to generate a solar calendar observatory that does something special on the solstices and, optionally, the equinoxes.

It comes in two flavors: A "standing stone" and a "cave".

The standing stone version has pairs of towers that the Sun will shine through and onto the gnomon at sunris