Season 20 Episodes13
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The Sun and the Earth
May 20, 1976
The Sun sends us its light and heat, but it has many other effects on the earth too. It raises tides; it produces the lovely Polar lights; it has long-term effects on plant growth - and its variations may even cause ice ages. Patrick Moore
Seasons70
Episode Summary
"The Sun and the Earth" is episode 5 of The Sky at Night season 20. It aired on May 20, 1976.