Speed of Light in the 17th century
May 1, 2025 - Reading time: ~1 minute

I learned today that Io's eclipses allowed a legendary dude to calculate the speed of light in the 1600s!

https://www.amnh.org/learn-teach/curriculum-collections/cosmic-horizons-book/ole-roemer-speed-of-light

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I'm just a guy who was told about flat earth, looked into it, and decided after a lot of thought that it's a ball. This site is a catalog of all the topics I looked into.

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