Local Day


Local Day refers to the period of time between two successive transits of the Sun over the local meridian. In aviation, local day is used to determine the start and end of the flight operations at an airport. The local day may vary from the standard 24-hour day due to the longitude of the airport. For instance, airports located near the International Date Line may have a local day that is ahead or behind the standard day. Pilots and air traffic controllers use the local day to calculate the time of sunrise and sunset, which is important for flight planning and scheduling. Additionally, the local day is used to determine the validity of certain flight documents, such as weather reports and NOTAMs.


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