A not-all-together sane way of showing a class how retrograde motion works!


WATCH VIDEO

Here's how to show your students why stars twinkle in the night sky!


Watch Video:

The geometry behind moon phases.


Watch Video:

 

 

Read more: Phases of the Moon

Sunspots are "dark" spots on the surface of the sun.

Here's how to show students why they appear dark.


Description:

Eclipses occur as a result of the geometry between the Earth, Moon, and Sun.


Watch Video:

 

 

Read more: Why Do Eclipses Happen?