what does T- mean in a space shuttle launch?

Question

in the countdown what does it mean when they say t-10 9 8 7 ect

Answer 1

It refers to the time before the launch.
The clock starts counting up from zero when the shuttle is launched, "minus" time is counted backward from zero indicating time before the launch.

"T minus 10 second" --> 10 seconds before lift off,
"T 10 seconds" --> 10 seconds after lift off.

Answer 2

n the context of a rocket launch, the "T minus Time" is the time before launch, e.g. "The countdown was held at T minus 5 minutes for 3 minutes and 40 seconds". The last ten seconds are usually counted down aloud "10, 9, 8, 7, 6, 5, 4, 3, 2, 1, Lift off!"
cpy/pste from Wiki there, but god question!

Answer 3

Use of T time takes away from the need of a watch. You have a counter clock in lauch control and one similar in the space vehicle. I think one hung said it first but T minus is the time before launch and t plus is intoi the mission.

Answer 4

In scientific equations the "T" denotes "Time". Just as the speed ofo light is assigned the letter "C", mass the letter "M", and Velocity the letter "V". T-10 in other words means "T", the point in time that liftoff takes place minus 10 seconds. Or 10 seconds till liftoff.

Answer 5

sure. it's going to truly end the manned u.s. area software. nasa have been construction the orion tablet and aries rocket as a shop on with as much as the return and forth. however the obama administration canceled it. so now as quickly as the final return and forth flies this 12 months the u.s. will haven't any thank you to launch human beings into area ever back. different than by ability of procuring for rides on russian launches. there is been some lip provider with regard to the u.s. identifying to purchase rides to earth orbit from "inner maximum" agencies yet this is not something better than a wishful pipe dream. no inner maximum corporation has ever released a human into orbit on this is very own and there is actual no marketplace to help inner maximum launches. at $50 to $one hundred million consistent with passenger on each and each rocket launch no person different than a billionaire might desire to discover the money for a value ticket into orbit. and there is not adequate billionaires to maintain a private launch corporation in company. (what number journeys to the iss can invoice gates or warren buffet make each and each 12 months?) as a count of fact some aerospace contractors (lockheed and boing i think of) easily tried to commence a private launch consortium for satellites approximately ten years in the past. their consortium went bankrupt interior of a pair years for loss of shoppers. and this is actual that nasa might desire to proceed doing unmanned area missions for here few years. yet that's certain to end too formerly long. unmanned exploration does not create an identical excitement as human area-flight and does not garner an identical public help. interior of a pair years you will determine to pay attention washington funds cutters clamoring to end nasa's unmanned area software merely as loudly as they ended the manned software immediately. what you're seeing immediately's the completed termination of u.s. area exploration to any extent further.

Answer 6

T- means Time before launch
T+ means Time after launch

If you listen during a launch you can actually hear them say "T-**(Hours/mins/sec) to Launch"

Answer 7

I'm pretty sure it is Mission Time. If you hear "T minus 10 secs" it means the time _before_ blastoff. If you hear "T plus 2 hours" the mission is 2 hours old.

Answer 8

it is the point of which the lift off is in the clear and getting things ready for the take off and if any problems show up then they can abort the mission if needed. hope this helps

Answer 9

Well, I'm not sure, but it may mean "time" as in like "ETA" estimated time to arrival or something like that.

I'm not exactly 100% sure, but that's my best guess.

Answer 10

T-Time is the launch time.

Like D-Day was, well, D-Day.