What is the definition of night in the UK according to the Rules of the Air?

The definition of night in the UK, as per the Rules of the Air, is specified as the period starting from 30 minutes after sunset until 30 minutes before sunrise. This definition is important for pilots because it establishes the specific times when certain regulations apply, including those related to visibility, lighting requirements for aircraft, and the necessity for special flight training for night flying.

Answering B reflects an understanding of how regulatory definitions can differ from common interpretations. Many might think of night in a broader sense, encompassing the time from sunset to sunrise, but for legal and operational contexts within aviation, defining it more narrowly allows for clearer adherence to safety protocols. The other options do not align with this specific definition and may cause confusion about when certain aviation rules and regulations are in effect.