ΔT

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:

• The interval of time used in determining velocity.
• The increment between successive nerve impulses.

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

• Discussions of climate change.
• Discussions of heat transfer.
• Discussions of the effects of thermal gradients.

See also Delta time (disambiguation).

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