Under normal conditions, however, both of these countdowns are in perfect sync. This is the natural countdown, and as such, it is never stopped (unlike the T time, which can be stopped). вЂL-minusвЂ™ refers to the actual days, hours and minutes remaining in a scheduled launch, wherein the launch occurs exactly at L-0. Thus, the T-time can be stopped according to pre-planned holds in the launch procedure. There are pre-planned holds in the countdown process, during which time the T-time is also stopped. вЂT-minusвЂ™ refers to the time remaining (until the launch) on the official countdown clock. For instance, if a satellite is going to collide with a comet in 5 hours, NASA ground staff would phrase the countdown to the encounter as вЂњE-minus 5 hoursвЂќ What could be the difference between вЂT-minusвЂ™ and вЂL-minusвЂ™ you ask? For example Once a satellite is already in space. The вЂEвЂ™ in вЂE-minusвЂ™ stands for вЂencounterвЂ™ or вЂeventвЂ™. However, as mentioned above, thereвЂ™s a small difference between вЂT-minusвЂ™ and вЂL-minusвЂ™. The вЂTвЂ™ might not always be related to time, depending on the setting/situation in which itвЂ™s being used.ДЄpart from вЂT-minusвЂ™, another term thatвЂ™s used a lot is вЂL-minusвЂ™, which is also a countdown to the launch of a rocket. However, the вЂTвЂ™ in the вЂT-minusвЂ™ can also stand for вЂtestвЂ™. In more technical terms, the вЂTвЂ™ in вЂT-minusвЂ™ is a designator for the main sequence countdown time that serves as the synchronization device for most of the equipment and procedures that must be completed before, during and after the launch. In a NASA countdown to a rocket launch, вЂT-minusвЂ™ translates to вЂTime minusвЂ™ the вЂTвЂ™ stands for the exact time at which the rocket is scheduled to be launched. What does the вЂTвЂ™ in вЂT-minusвЂ™ stand for?

It also consists of a countdown to a certain event during the mission.

ThereвЂ™s also вЂE-minusвЂ™, a term commonly used in mission planning. At that time, the announcer says, вЂT-minus 10, 9, 8вЂ¦.3, 2, 1 and liftoff!вЂ™ As the time of the launch gets closer, the countdown will read вЂT-minus 9 hoursвЂ™, вЂT-minus 5 hoursвЂ™, вЂT-minus 55 minutesвЂ™ and so on until it reaches the most iconic part of the launch countdown вЂ“ the final 10 seconds prior to the launch. Thus, the вЂT-minusвЂ™ countdown will read вЂT-minus 10 hoursвЂ™. Imagine that NASA is going to launch a rocket in 10 hours. Sometimes, instead of вЂT-minusвЂ™, you may hear the term вЂL-minusвЂ™ that is also a countdown to a rocket launch, but there is a difference between the two, which will be explained below. ItвЂ™s essentially a countdown, i.e., a sequence of reverse counting that signifies the вЂtime remainingвЂ™ before the exact moment when a scheduled event will occur. Whether they are sending humans to space or just an unmanned satellite, NASA commonly employs the term вЂT-minusвЂ™ during the preparation and lead-up to a space launch. During a NASA countdown to a rocket launch, вЂT-minusвЂ™ translates to вЂTime minusвЂ™ the вЂTвЂ™ stands for the exact time at which the rocket is scheduled to be launched. The term вЂT-minusвЂ™ is generally used during countdowns to space launches. T-minus can be counted in seconds, minutes, hours, days, weeks, months and years ahead of a fixed liftoff time. That is, you are timing negatively with numbers of increasing value from a future fixed time. It means you are starting with an exact time the rocket has to liftoff, and you are planning all the events backward to the present time.

There may be very few times in a year that the timing will be opportune. The liftoff timing has to do with obtaining the correct trajectory, best weather conditions, and many other concerns. When time is represented on a graph or timeline or drawing, convention shows time increasing positive in the right direction and increasing negative (minus) to the left direction. Indeed, T-minus, L-minus and certain other вЂminusesвЂ™ are all countdowns, but the difference between the first two is rather interesting yet something that is not really commonly known.ДЄlso Read: Is Spaceship Explosion Possible Just Like in Science Fiction Movies? Perhaps even have accepted the fact that these are both the same thing: Countdowns to a rocket launch. Perhaps some may already what is вЂњT-minusвЂќ and also the difference between вЂT-minusвЂ™ and вЂњL-minusвЂќ. We usually understood that it was the countdown to the launch of the rocket, but it couldвЂ™ve taken quite a while to understand why they are called it вЂT-minusвЂ™ or even вЂL-minusвЂ™ in some cases.

What does t minus