Delta Time (other)
Delta time can mean: * ΔT (timekeeping), the time difference between Universal Time and Terrestrial Time. * Delta timing, a technique used in graphics programming. See also * ΔT (other) The symbols Δt and ΔT (spoken as "delta T") are commonly used in a variety of contexts. Time * ΔT (timekeeping) the difference between two time scales, Universal Time and Terrestrial Time, which results from a drift in the length of a day * The ...

ΔT (timekeeping)
In precise timekeeping, Δ''T'' (Delta ''T'', delta-''T'', delta''T'', or D''T'') is a measure of the cumulative effect of the departure of the Earth's rotation period from the fixed-length day of International Atomic Time (86,400 seconds). Formally, Δ''T'' is the time difference between Universal Time (UT, defined by Earth's rotation) and Terrestrial Time (TT, independent of Earth's rotation). The value of ΔT for the start of 1902 was approximately zero; for 2002 it was about 64 seconds. So Earth's rotations over that century took about 64 seconds longer than would be required for days of atomic time. As well as this long-term drift in the length of the day there are short-term fluctuations in the length of day () which are dealt with separately. Since 2017, the length of the day has happened to be very close to the conventional value, and ΔT has remained within a second of 69 seconds. Calculation Earth's rotational speed is , and a day corresponds to one period . A r ...
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Delta Timing
Delta time or delta timing is a concept used amongst programmers in relation to hardware and network responsiveness. In graphics programming, the term is usually used for variably updating scenery based on the elapsed time since the game last updated, (i.e. the previous " frame") which will vary depending on the speed of the computer, and how much work needs to be done in the program at any given time. This also allows graphics to be calculated separately if graphics are being multi-threaded. In network programming, due to the unpredictable nature of internet connections, delta timing is used in a similar way to variably update the movement information received via the computer network, regardless of how long it took to receive the next data packet of movement information. It is done by calling a timer every frame per second that holds the time between now and last call in milliseconds. Thereafter the resulting number (delta time) is used to calculate how far, for instanc ...
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