Light Travel Time Calculator
Calculate Light Travel Time
Formula
time = distance / speed_of_light
Frequently Asked Questions
How fast does light travel?
Light travels at 299,792.458 km/s in vacuum. It takes about 8.3 minutes to reach Earth from the Sun.
How long does light take from the nearest star?
Proxima Centauri is 4.24 light years away, so its light takes 4.24 years to reach us.
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