Light travels at about 186,000 miles per second
Roemer was the first to measure the speed of light.
Light years
No, a megaphone is a device used to amplify sound, particularly human speech. It does not measure light or speed.
by getting boners.
Roughly speaking, light moves about a million times faster than sound in air.
Light is faster because speed does not move. Speed is a measure of the rate of movement but, in itself, it does not move - at all!
The speed of light isn't a distance so it has no length it is a measure of speed, which is roughly 186000 miles per second.
It doesn't work that way. The light-year is not used to measure the speed of light. It works the other way round: First, the speed of light is determined through other methods, then the distance called a light-year is calculated based on that measurements.
Are you asking when the speed of light was first estimated, or are you asking when the speed of light was first actually measured?
Galileo attempted to measure the speed of light using lanterns positioned at known distances and observing the time it took for light to travel between them. He would uncover the lanterns simultaneously and use a telescope to try and detect any delay in the light reaching his eyes. However, his methods were not sensitive enough to accurately measure the speed of light.
The speed of light is always the same, as long as the light stays in vacuum or in the material substance it's in. The speed of the source generating the light, or the speed of the person who's measuring the light, has no effect on the light's speed. It will always measure the same number. That means: -- If a rocket is in space, flying toward you at half the speed of light, and the astronaut aboard shines a flashlight at you, and -- If you strap a jet-pack on your back and fly toward the rocket at half the speed of light, and -- If you measure the speed of the light from his flashlight as it shines past you, -- You'll measure the same speed of light as if you and the astronaut were both standing still. It can't be . . . But it is. It's been confirmed in thousands of experiments during the past 100 years.
Well... yes, but it's not a very useful one. Light travels one light year in... one year. So the speed of light (which you cannot accelerate to) is about 1/8766 light years per hour.