I disagree with Anonymous. NIGHT (without qualification) is the end of civil twilight which is 20-30 minutes after sunset. The only place "one hour after sunset" appears anywhere in the regs is for logging currency to carry passengers.
Summary of all "night" stuff:
VFR cloud clearance changes go by the FAR 1 definition -- civil twilight. As do Private and Commercial aeronautical experience, and night logging of time.
91.209 says you turn the lights on AT sunset and off AT sunrise and doesn't follow the FAR 1 definition.
Special VFR also isn't allowed after sunset and until sunrise unless Instrument rated. (AIM)
Night currency to carry passengers only applies one hour after to one hour before sunset/sunrise as does night currency logging of landing AND takeoffs. (Many people don't log takeoffs and technically it's required. My logbook has spots for both, many don't. Best make a comment if it doesn't.)
Passenger currency is the real oddball with nothing else following the one hour after/before rule.
Nobody's going to notice that 4 minute difference in civil twilight unless they're logging with a stopwatch so ... simplified ... it is...
- Lights on and no more Special VFR at sunset. (Sunset to sunrise.)
- 30 minutes later start logging night time and stay further away from the clouds. (Civil twilight.)
- 30 minutes after that, log takeoffs and landings for currency ... or kick the passenger out. They like that. If they're a skydiver. (One hour after sunset/before sunrise.)
Reverse if you're a morning glory instead of a night owl.
I can't think of any others. You?