Question

the period of twilight and dawn increases to polewards​

Answer 1

Answer:

Explanation:

This is because period during which the refracted light is short as the sun rises and sets in a vertical path. On the other hand, in the temperate latitude period of refracted light is longer as the sun rises and sets in an oblique path 

As one travels northward towards the pole, the sunward circumference of the earth decreases. Since this means the sun can more easily ,’see around' the earth, as there is ‘less earth' to get in the way, the nights grow shorter (in the summertime, of course). So, more opportunity for ‘twilight'. Obviously, the opposite happens in the winter, to the extent that in the Arctic circle, the sun sets for almost six months.