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Light - Calculate Distance per Time
Stopwatch and calculator for calculating the distance light travels in a medium in a given time. The speed of light is constant and is almost 300000 kilometers per second in a vacuum. The light therefore covers a very large distance in a short time. It takes a little over a second to get to the moon and about 8 minutes from the sun to us.
The calculator can also be used without the stopwatch, simply enter time or distance and press Calculate.
Physics commonly uses SI units. Here is a calculator to convert units.