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How did ancient civilizations use sundials to tell time?
electronics.howstuffworks.com/gadgets/clocks-watches/ancient-civilizations-use-sundials.htm
Ancient sundials first popped up in Egypt around 1500 B.C. Learn how these sundials came about and what they were used for all those centuries ago.
How Astrolabes Work
electronics.howstuffworks.com/gadgets/clocks-watches/astrolabe.htm
Astrolabes are exquisitely crafted instruments that have hundreds of uses. Isn't it time you learned how to use this handy decoder of the sky?
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