what dose GMT stand for and how dose it work
2007-03-08 16:19:13 · 11 answers · asked by Samantha 2 in Science & Mathematics ➔ Geography
what number is ottawa located
2007-03-08 16:25:19 · update #1
GMT stands for Greenich Mean Time. It is the time zone you can use to find other places' times.
Ottawa's time zone is in the Eastern Time Zone which is GMT -5.
2007-03-08 17:45:36 · answer #1 · answered by blah 3 · 2⤊ 0⤋
Greenwich Mean Time (GMT) is a term originally referring to mean solar time at the Royal Observatory, Greenwich in England. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, although strictly UTC is an atomic time scale which only approximates GMT in the old sense. It is also used to refer to Universal Time (UT), which is the astronomical concept that directly replaced the original GMT.
Noon Greenwich Mean Time is not necessarily the moment when the Sun crosses the Greenwich meridian (and reaches its highest point in the sky in Greenwich) because of Earth's uneven speed in its elliptic orbit and its axial tilt. This event may be up to 16 minutes away from noon GMT (this discrepancy is known as the equation of time). The fictitious mean sun is the annual average of this nonuniform motion of the true Sun, necessitating the inclusion of mean in Greenwich Mean Time.
Historically the term GMT has been used with two different conventions for numbering hours. The old astronomical convention (before 1925) was to refer to noon as zero hours, whereas the civil and more modern convention is to refer to midnight as zero hours. The more specific terms UT and UTC do not share this ambiguity, always referring to midnight as zero hours.
For more please read my source:
2007-03-08 19:35:02 · answer #2 · answered by Tom Cat 2 · 1⤊ 0⤋
Greenwich Mean Time, based on the time at Greenwich Observatory near London, was the standard world time until about 1975. It was then replaced by UTC, which is co-ordinated universal time, kept by a number of atomic clocks around the world which are synchronised with each other.
The diffference between GMT and UTC is unimportant to the man in the street - they're both the same time, just coming from two different clocks.
The four time zones in the 48 contiguous states of America are EST (UTC minus 5 hours), CST (UTC minus 6 hours) MST (UTC minus 7 hours) and PST (UTC minus 8 hours).
2007-03-08 23:19:10 · answer #3 · answered by Gnomon 6 · 0⤊ 0⤋
Greenwich Mean Time
2007-03-13 04:47:11 · answer #4 · answered by sammy 2 · 0⤊ 0⤋
Greenwich Mean Time
2007-03-08 16:24:41 · answer #5 · answered by tiffany 6 · 0⤊ 0⤋
Greenwich Mean Time
2007-03-08 16:22:28 · answer #6 · answered by ? 6 · 1⤊ 0⤋
Greenwhich mean time - a city outside london - location of the prime meridian
2007-03-08 16:25:37 · answer #7 · answered by Louis D 2 · 0⤊ 0⤋
yrez got it right,its Greenwich mean time,and its the standard by which all other time zones set their time,from(basically its the point/lattitude they start the time zones from
2007-03-08 16:25:14 · answer #8 · answered by stygianwolfe 7 · 0⤊ 0⤋
it means Greenwich mean time
2007-03-08 20:36:59 · answer #9 · answered by junaid a 1 · 0⤊ 0⤋
greenwich mean time
2007-03-15 23:47:12 · answer #10 · answered by ray 2 · 0⤊ 0⤋