system
Given the following post, respond as if you're commenting on Reddit:
human
How did we first measure the speed of light?

Title kind of says it all.

I wonder how we first discovered and measured the speed of light in a greater historical context. 

Were there proceeding discoveries that light even had a speed at all and wasn't instantaneous?  How did we realize the speed of light could be measured?  Who was the first person to invent the method to measure the speed of light? How did we know it was accurate?

Thanks science peeps!
gpt
The first attempt was by Galilleo, who had his assistant stand on an opposite  hilltop at night with a lantern, and they tried opening and closing their lanterns really fast. This did not work.

The first indirect measurement was by Roemer, who realized that the time at which Jupiter's moons appeared to be eclipsed was delayed depending on whether Jupiter and Earth were closer together in their orbits or not.

The first direct measurement was by Fizeau and Foucault, who shone light through a rapidly rotating cog, off a distant mirror, and back towards the cog. The speed of the cog required for light to bounce back through an adjacent gap is related to the speed of light.