-- Origin of longitude -- Zero degrees longitude -- Boundary between Eastern and Western Hemispheres -- Greenwich Meridian
The Greenwich Meridian, also known as the prime meridian or International Meridian, bisects the primary division of time zones. Each time zone is 15 degrees of longitude in width, with local variations, and observes a clock time one hour earlier than the zone immediately to the east. The time difference between two meridian lines is one hour (the time difference between two longitudinal lines is 4 minutes and consequently the time difference between 15 longitudinal lines; or two meridian lines; would be one hour). Refer to link below.The Greenwich Meridian bisects the primary division of time zones. Each time zone is 15 degrees of longitude in width, with local variations, and observes a clock time one hour earlier than the zone immediately to the east. The time difference between two meridian lines depends on where you draw the lines. There is no official standard set of lines that everyone is required to use, and a line can be drawn at ANY longitude. Whatever the longitude difference is between the two meridians you decide to consider, the time difference between them (in hours) is nominally 1/15 of that angle.
Greenwich Mean Time is the local mean time at Greenwich, England, which is along the prime meridian (0° longitude).
Because the Headquarters of the Admiralty, the British Royal Navy, were in Greenwich, SE London, when the measurement of Longitude was discovered.
Helsinki, Finland is 2 hours ahead of Greenwich
Prime Meridien is also called Greenwich Meridien. They are not different.
India Standard Time is five and a half hours ahead of Greenwich Mean Time.
5 hours. Example: 9 AM Eastern Standard Time {EST} = 2 PM Greenwich Meant Time {GMT}
Greenwich Mean Time (GMT) was historically the noon time when the sun crossed the Greenwich Meridian in the UK. Although technically this is no longer the case, it is still refered to as the arbitary time from which the other times are derived and is the global time standard. Standard time would vary and I must assume that this the 'standard' time where you live. So if you live in Dallas, TX you'd be GMT + 6; i.e. you are running 6 hours behind Greenwich.
-- Origin of longitude -- Zero degrees longitude -- Boundary between Eastern and Western Hemispheres -- Greenwich Meridian
The Greenwich Meridian, also known as the prime meridian or International Meridian, bisects the primary division of time zones. Each time zone is 15 degrees of longitude in width, with local variations, and observes a clock time one hour earlier than the zone immediately to the east. The time difference between two meridian lines is one hour (the time difference between two longitudinal lines is 4 minutes and consequently the time difference between 15 longitudinal lines; or two meridian lines; would be one hour). Refer to link below.The Greenwich Meridian bisects the primary division of time zones. Each time zone is 15 degrees of longitude in width, with local variations, and observes a clock time one hour earlier than the zone immediately to the east. The time difference between two meridian lines depends on where you draw the lines. There is no official standard set of lines that everyone is required to use, and a line can be drawn at ANY longitude. Whatever the longitude difference is between the two meridians you decide to consider, the time difference between them (in hours) is nominally 1/15 of that angle.
South African Standard Time (SAST) is UCT +02:00
Greenwich Mean Time is the local mean time at Greenwich, England, which is along the prime meridian (0° longitude).
New York is on US Eastern Standard Time which is the same as Greenwich Mean Time -5. That means that New York is 5 hours behind the time at the Prime Meridian in Greenwich England (GMT 0). Examples: When it is 6:00 am in New York, it is 11:00 am at Greenwich Mean Time in England. The US Central Standard time = GMT -6, so when it is 6:00 am in New York, it is 5:00 am in the Central time zone and 11:00 am in England.
The standard time, or "winter time", in Great Britain is Greenwich Mean Time. Nepal is 5:45 ahead of Greenwich Mean Time (12 noon GMT = 5:45 PM NPT).
Because the Headquarters of the Admiralty, the British Royal Navy, were in Greenwich, SE London, when the measurement of Longitude was discovered.
differences between equator and prime meridian