"T minus zero" means "out of time."

This comes from a countdown convention used in by both the American military and NASA.

Generally, it is used when counting down to a major event that will happen at a specific time.

Mathematically, T is time, minus whatever amount of time is left until the event happens.

If the News Years ball is dropping in 10 minutes, one could say "The ball is dropping in T minus 10 minutes and counting!"

Therefore, "T minus zero" means that there is no time left.

This comes from a countdown convention used in by both the American military and NASA.

Generally, it is used when counting down to a major event that will happen at a specific time.

Mathematically, T is time, minus whatever amount of time is left until the event happens.

If the News Years ball is dropping in 10 minutes, one could say "The ball is dropping in T minus 10 minutes and counting!"

Therefore, "T minus zero" means that there is no time left.

I was working on my term paper all night for my morning class, and all the sudden I looked up at the clock and realized I was t minus zero.

by HanClinto
May 11, 2004

The termination of a countdown. Afterwards, time is denoted by 't plus <amount of time>'

We are at t minus zero. We have ignition and liftoff.

by pythonspam
May 13, 2004

What Mission Control in the Houston Space Center never says. They stop after T Minus 1 because T Minus zero is not significant in the countdown.

T Minus 5,4,3,2,1,0...o theyre already gone!

by Will
May 12, 2004

it means "now". t=time... minus zero..

t minus 20 would mean 20 minutes from now, assuming time was like a stopwatch counting down.

by Bethany Nolan
May 12, 2004

Time to go, i.e. liftoff or the beginning of an operation.

T minus zero, time to leave...

by RGE
May 13, 2004

when a space ship of some sort is about to take off

tminus 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, blast off

by cullen
May 12, 2004