The Planck time reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Planck time

The Planck time is the natural unit of time, denoted by t_P.

t_P = (G / c⁵)^1/2≈ 5.391 × 10^-44 seconds

where:

is Dirac's constant

G is the gravitational constant

c is the speed of light in a vacuum

See also

• Natural units
• Planck length
• Planck mass

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