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All Time Zones around the Globe

Planet Earth is more or less a ball shape and might be devided into 360 degrees steps called Longitudes. To find a common way of marking these Longitudes, per international definition the longitude that goes through the english city of Greenwich is defined as 0 degrees. If you start from there going east the angle is positiv between 0 and +180 degrees, in the opposite way going west you'll find negative angles.
Another definition based on the rotation of the earth says that every 15 degrees a new time zone starts, which means one hour difference to the previous zone, meaning that after a full rotation you passes all 24 time zones.
Normally country borders doesn't match with longitudes, therefore there are a lot of country related special regulations, e.g. in India, which is 5.5 hours ahead of UTC or China, covering theoretically about 5 time zones, but using only one common time zone in the whole country.