Historical Events tagged with "roemer"
Turns out history loves a label—battles, breakthroughs, and the occasional disaster, all neatly tagged for your browsing pleasure. Because sometimes you just need every weird invention in one place.
Science & Technology
Ole Rømer Measures Speed of Light
November 21st, 1676 348 years ago
Danish astronomer Ole Rømer quantitatively measured the speed of light using observations of Jupiter's moon Io. He noted discrepancies in Io's orbital timing based on Earth's varying distance from Jupiter, leading to a groundbreaking calculation of light's speed at approximately 220,000 kilometers per second. His innovative approach established a foundation for future studies in optics and astronomy.
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