Simon Clark on MSN
How a medieval scientist figured out where space begins
I put a 1,000 year old theory to the test. According to a scholar living 1,000 years ago in Andalusia, by taking two simple measurements of Twilight and applying some trigonometry you can estimate the ...
Carol M. Kopp edits features on a wide range of subjects for Investopedia, including investing, personal finance, retirement planning, taxes, business management, and career development. Andy Smith is ...
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