How is the duration of twilight influenced by seasons?

The duration of twilight is influenced by seasons because it is related to the angle at which the Earth's axis tilts towards the Sun, which changes as the Earth orbits around the Sun throughout the year.

In summer, the Sun sets at a shallower angle, causing longer periods of twilight. The twilight period is defined as the time between sunset and when the Sun is 18° below the horizon. Since the angle of the Sun's descent is more gradual in summer, it takes longer for it to reach the 18° mark, resulting in longer periods of twilight.

In winter, the Sun sets at a steeper angle, causing it to reach the 18° mark more quickly, resulting in shorter periods of twilight.