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

Using a laser and some boiling water,

you can show why planets do not appear to twinkle in the night sky. 


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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?