This application calculates the distance between user's location and the location where skylightning hits the ground.
When you notice the lightning in the sky simply press "Start". Press "Stop" when you hear the thunder sound in its peak.
How does it work ?
When you press "Start" a soundspeed formula calculates the time needed for the sound to "arrive" to your location. By pressing "Stop" you get information on how far away from you the lightning has hit the ground.
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