Question

the period of Twilight and dawn increase polewards why

Answer 1

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.
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Answer 2

Answer:

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.

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