the period of Twilight and dawn increases polewards.give reason.
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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.
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.
Answered by
64
Answer: because on account of the oblique path of the sun towards pole than the vertical path along the equator, the length of dawn and twilight is greater, as it is nearly one hour near equator and 50 days at the pole.
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