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


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


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

Watch Video:



Read more: Why Do Eclipses Happen?

This demonstration shows how atmospheric scattering filters 

the colour of the sun during a sunset.

Watch Video:


Read more: Why Are Sunsets Red?