Board Thread:Eureka Moments/@comment-27860632-20161117174628/@comment-26585309-20161118131544

Way back in time, time was kept using chronometers. GMT stands for Greenwich Meridan Time. This is time based on the Prime meridan and the earths rotation using the Royal Observatory in Greenwich, London. In the late 1880's because Britain was the most powerful shipping country in the world at the time and was using GMT, GMT was adopted as the world standard for keeping time even though UTC was around. Due to the Earth's uneven speed and elipitcal orbit and axial tilt, noon (12:00:00) GMT is rarely the exact time the suncrosses the Greenwich Meridian to reaches highest point in the sky.This can occur up to 16 minutes before or after noon GMT. UTC is based on astronomical or solar time in reference to the earth's rotation. Therefore for some using GMT the day would start at noon and other midnight. So, UTC(Coordinated Universal Time) was adopted in the late 1960's. Now, just as a side bar, also in the early 1900"s, the U.S. was having problems with train schedules as everyone needed to be on the same page. What is 7 am in New York City is not 7 am in  Chicago  or San Franciso.7 am- is not 7 am for everyone at the same time and many people looking at a train schedule were missing their trains. Everyone need to be on the page. So In the early 1900"s just after WWI, the U.S passed an act creating time zones AND daylight savings time. Since most all of the world is now UTC, GMT has actually. become a "Time Zone". Thanks for taking the time to read.