Domanda 380, General Navigation - ATPL - Airline Transport Pilot license

Civil twilight at the equator lasts longer than at 60 NM or 60°S because the radius of the equator is larger than the radius of the 60°parallel.
The duration of the civil twilight on 21st of march and on 23rd of September is equal at all places on Earth independent of latitude.
The declination of the Sun and the latitude of the observer will affect the duration of civil twilight.
Only the declination of the Sun will affect the duration of civil twilight.