What is the definition of nighttime in aviation terms?

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In aviation, nighttime is defined as the period between the end of evening civil twilight and the beginning of morning civil twilight. This definition is essential for pilots because it impacts various operational procedures, including the requirements for instrument flight rules (IFR) and visual flight rules (VFR), as well as the use of anti-collision lights and other safety measures.

Civil twilight is the time when the sun is just below the horizon, and light remains sufficient for most outdoor activities without artificial lighting. After civil twilight ends, visibility decreases significantly, marking the start of nighttime operations, which introduces different regulations and requirements for flight. Establishing this definition helps pilots to understand when specific regulations apply, such as the need for appropriate lighting on the aircraft and the necessity for increased vigilance during night flights.

This understanding supports safe flying practices, as pilots need to prepare for reduced visibility and different atmospheric conditions present during nighttime hours.

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