Under night flight recency rules, if sunset is 1830, what is the latest time to carry passengers after that sunset?

• A. 1929
• B. 1925
• C. 1930
• D. 1900

Answer: (A)

Night currency is based on the period defined as the end of evening civil twilight to the start of morning civil twilight, not a fixed clock offset after sunset. Evening civil twilight ends when the Sun is a certain distance below the horizon, which varies with date and location. In this scenario, sunset is 1830, and the end of civil twilight is at 1929, so that is the latest time you can count a flight as occurring at night for recency purposes. Times earlier than that (like 1900 or 1925) would be before night ends, and a time after (like 1930) would be after night has ended. Therefore, the latest time to carry passengers after that sunset is 1929.