The man who measured light's speed on earth (1849)

I did this myself when I was 16 at school. The school only had one laser (they were very proud of) I designed and built my own detection and amplification electronics and hooked to up to a CRO and used stroboscopic disk an mirrors similar to what is depicted. I did it on a Saturday (school was worried about kids being blinded) across the space between two school buildings. All worked perfectly.

Fizeau’s deranged wooden wheel didn’t just measure light in 1849. It yanked the universe’s fastest thing down from heavenly myth into a messy Parisian attic and turned it into a lab rat you could actually clock with teeth and mirrors.

This is fuckin genius

What light source did he use to have sufficient intensity over a distance of several kilometers?

Ole Rømer did that long time before

White people used to be gnarly man what happened to us?

Calculated..... V=S/t You can't measure light speed directly.

この動画においては、古いフィルム風の演出はいらないと思う

フィゾーが1849年に回転歯車を使って光速を求めた実験のモデル。 こういう風にアニメーションになると、どういう原理で測れたのかわかりやすいよね。 そして今、2026年、光が１秒以上かかる場所へ人類は再び行こうとしている！

Very interesting method for sure.

Incredible

no he did not

What is the precision required for orientation and flatness of the mirror reflecting the light from 8 km away ? @grok

ほーすごい

The speed of light is not measured. There is a lot of presumption. Number one being does a travel to the mirror at the same speed that it travels back.

real genius

Lasers didn't exist in 1849

Ole Rømer measured the speed of light in the solar system, observing Io in 1676

Wrong