When do night operations begin and end?

Night operations begin 30 minutes before sunset and end 30 minutes after sunrise. This standard timing is crucial because it provides a clear and consistent framework for transitioning from day to night operations and vice versa.

The half-hour before sunset allows personnel to prepare for the decrease in visibility and to complete essential activities while there is still some light. Conversely, the 30 minutes after sunrise enables operations to continue in the early morning light, ensuring safety and efficiency as visibility improves. This timing helps to account for natural light changes and aids in planning for airfield operations, navigation, and other activities that rely heavily on visibility.

Overall, adhering to this schedule promotes safety and operational effectiveness, making it the correct answer for when night operations are defined to start and conclude.