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


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


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The geometry behind moon phases.


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Read more: Phases of the Moon

Description:

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


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Read more: Why Do Eclipses Happen?

This demonstration shows how atmospheric scattering filters 

the colour of the sun during a sunset.


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Read more: Why Are Sunsets Red?