What is GMT? 10 points?

Question

Explain me clearly that what is GMT & why is it?

Answer 1

GMT or Greenwich Mean Time. The time at 0 degrees longitude (greenwich, england) The Royal Greenwich observatory sits right on the zero line.

In this vast world, things happen. Especially with space travel a means of timing the event. Since the world is full of different cultures, great events and their timing led to problems as no one wanted to slight anyone else by using somebody else's time.  Plus there was always the question of whose time to use. Remember the saying the Sun never sets on the British Empire. Since Britain was one of the top dog countries, it fell on them to arrange for a standard time. Since the royal astronomers used the observatory at Greenwich England, and were the leading astronomers at the time, their time was used.

As time went by, GMT was adopted to be used by everyone world wide  for events that included the world population. As its use spread, other names were given. The military used it as ZULU time, and all military time is recorded worldwide in the hour and minutes zulu. ( 12 noon is 1200z) Radio logs are kept 0001z to 2359z as the descrepancy over 2400z and 0000z still rages on.

The current time standard updates and corrects itself so now it is known as Co ordinated Universal Time or UT.

Refer to my answer to the calender question, calenders show the moon phases, and the 4 cardinal, points of seasons depending on the publisher. Some use local time and the smart ones use UT or co ordinated UT, or zulu time.

There are still areas that do not follow this teaching and their time may be off or vary and even be on the half hour when the rest of the world is on the hour.

Answer 2

I will assume you want Greenwich Mean Time (only thing I can think of in geography with that acronym) .  It is one of the 24 (well 25 if you count the international date line) artificially set lines going from the north pole mostly straight south to the south pole about every 15 degrees of longitude on the globe that set up the ~24 time zones(there are a few places that are not following the proper one).

It is the most important of them also as it is the origin line, that is it roughly follows 0 degrees longitude and all others time zones are based on it(IE add or subtract 1 hour per time zone you are away from it).  It is call that because it passes through Greenwich England where the gentlemen who create the system of dividing the world that way were meeting.

Answer 3

Mean solar time at the meridian of Greenwich. Abbreviated GMT. Also known as Greenwich civil time; universal time; Z time; zulu time.