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ΔT

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ΔT is a symbol for the difference between two time scales, Universal Time and Terrestrial Time, which results from a drift in the length of a day.

The symbols Δt and ΔT are commonly used in other contexts as follows.

Δt, a difference in time, may refer to:

ΔT, a difference in temperature, including thermodynamic temperature, may occur in:

See also Delta time (disambiguation).

See also finite difference for the mathematics of the Δ operator.