Changes

'''Greenwich Mean Time''', or GMT is the mean time that the [[earth]] takes to rotate from noon-to-noon. <ref>http://wwp.greenwichmeantime.com/what-is-gmt.htm</ref> The Greenwich Meridian ([[Prime Meridian]] or Longitude Zero degrees) marks the starting point of every time zone in the World.

'''Greenwich Mean Time''', or GMT is the mean time that the [[earth]] takes to rotate from noon-to-noon. <ref>http://wwp.greenwichmeantime.com/what-is-gmt.htm</ref> The [[Greenwich Meridian]] ([[Prime Meridian]] or Longitude Zero degrees) marks the starting point of every time zone in the World. Physically, it is marked by a brass bar and accompanying symbol in the forecourt of the Museum which replaced the original Royal Observatory at [[Greenwich]] in south-east [[London]].

 

For every 15˚ change in [[longitude]] away from the Prime Meridian, there is one hours' difference in local time, compared to that at Greenwich. Towards the east of Greenwich, the local time will be ahead of GMT, whilst to the west, local time will lag GMT. This has not only resulted in the world being divided into 24 time zones, but also large land masses and individual countries being divided into several time zones.

For every 15˚ change in [[longitude]] away from the Prime Meridian, there is one hours' difference in local time, compared to that at Greenwich. Towards the east of Greenwich, the local time will be ahead of GMT, whilst to the west, local time will lag GMT. This has not only resulted in the world being divided into 24 time zones, but also large land masses and individual countries being divided into several time zones.