Eastern Standard Time

Eastern Standard Time was a timekeeping term used on Earth in the 20th and 21st century. Known by the acronym "EST", the zone ran through a latitude of North and South America, including the eastern seaboard of the United States of America. The time zone was part of a global time synchronization system, extended along latitudes from and to the International Date Line. 

In 1969, the first manned moon mission, Apollo 11, was originally scheduled to be launched at 6 am, Eastern Standard Time.