{"product_id":"fizeau-experiment-yellow","title":"Fizeau Experiment — Yellow","description":"In 1849, a French physicist wanted to know exactly how fast light travels — and he wanted to measure it without looking at the stars.\n\nEvery attempt before Hippolyte Fizeau had relied on astronomy: watching the moons of Jupiter, timing eclipses across millions of kilometres. Fizeau set up his experiment on Earth instead. He mounted a toothed wheel on a hilltop in Suresnes, outside Paris, and a mirror on a hill in Montmartre, over eight kilometres away. He shone a beam of light through a gap between the wheel's teeth, let it travel the full distance to the mirror and back, and spun the wheel faster and faster — until the returning light was blocked by the next tooth in line.\n\nFrom the wheel's speed and the distance to the mirror, he calculated the speed of light: roughly 313,000 kilometres per second. The real number, measured with centuries of better technology, is 299,792. He was off by about four percent — using a toothed wheel, a mirror, and two hills in Paris.\n\nIt was the first time anyone had measured the fastest thing in the universe using nothing but careful engineering, on the ground, in a single city.","brand":"White Nights","offers":[{"title":"Yellow \/ S","offer_id":67581494460643,"sku":"WHITENIGHTS_FEY5461_RNHS-YL-S","price":799.0,"currency_code":"INR","in_stock":true},{"title":"Yellow \/ M","offer_id":67581494493411,"sku":"WHITENIGHTS_FEY5461_RNHS-YL-M","price":799.0,"currency_code":"INR","in_stock":true},{"title":"Yellow \/ L","offer_id":67581494526179,"sku":"WHITENIGHTS_FEY5461_RNHS-YL-L","price":799.0,"currency_code":"INR","in_stock":true},{"title":"Yellow \/ XL","offer_id":67581494558947,"sku":"WHITENIGHTS_FEY5461_RN1_RNHS-YL-XL","price":799.0,"currency_code":"INR","in_stock":true},{"title":"Yellow \/ XXL","offer_id":67581494591715,"sku":"WHITENIGHTS_FEY5461_RN1_RNHS-YL-XXL","price":799.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0804\/9062\/7299\/files\/17904078231048fizeau_experiment_yellow_mockup_1790391695952.png?v=1790407929","url":"https:\/\/whitenights.store\/products\/fizeau-experiment-yellow","provider":"White Nights","version":"1.0","type":"link"}