Then the Thunder

[Made in under 3h for Trijam #82] -- WARNING: the screen flashes.

The speed of sound is around 343 meters per second.

On the floor is a map. You are at the dot in the center and each concentric circle represents 300 meters away from it.

Where's the lightning strike?

More detailed explanation:

The circles on the ground are a map that you are at the center of, and each line represents 300 meters. The Speed of Sound is 341 meters per second.

So you can tell which direction the lightning is by looking at the shadows. And you can tell the distance by counting the time between the flash of lightning and the sound of thunder.

The lightning will strike the same place until you give your guess, at which point its position will be randomized.