Proper Time
& the Worldline
un
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.com · dτ² = dt² − dx²/c² · Twin Paradox · Invariant
Home clock τ
0.00
yr
Traveler τ
0.00
yr
Δage
0.00
yr
state
standby
Home twin (straight worldline)
Traveler (bent worldline)
Light cone (dτ = 0)
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