What is Greenwich Mean Time ?

Greenwich Mean Time is defined as the reference time zone for the world's time zones, a Greenwich longitude that passes through Greenwich, London, and is a zero-latitude longitude of the Earth. The latitude of this region is 38 °. 28 °. When the sun is at its highest point above the zero longitude of the Greenwich line, the clock is exactly 12 noon in the Greenwich area, and because the Greenwich line is the zero point, it is a reference to all meridians, Passed by a 15-length uniform timed line, the clock increases each hour by 15 longitude Time is not affected by the seasons. It is constant. Although scientists have replaced GMT at atomic time, Greenwich Mean Time is still the world's most widely used user.