Observer Time
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Far from the black hole, time passes normally. This is what you would measure from a safe distance.
Timefall: A Relativity Clock
Two clocks, one near a black hole and one far away. See how gravity changes the speed of time.
Gravitational Time Dilation
Δt' = Δt × √(1 - gravityFactor)
gravityFactor ≈ 0.80
Strong gravity slows time for anything nearby. From a safe distance, their clock appears to fall behind.
Near the Black Hole
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Close to the event horizon, gravity is strong enough to slow time itself. The clock here runs slower.
Gravity strength: 0.80
Time Differential
Adjust the slider to see how much time passes far away while just 1 hour passes near the black hole.
1 hour near the black hole equals
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of distant observer time.