The distance covered by 1 degree of longitude at the Equator and at 45 degrees latitude is not the same because of the elliptical shape of Earth.
Explanation:
The longitude lines are imaginary lines that move from east to west and circle the surface of Earth. The prime longitudinal line is the Equator, which lies on 0 degrees of latitude, and every other longitudinal line lies north and south of this one, thus on higher latitude. Despite all of the longitudinal lines being parallel to each other and moving in the same direction, the distance that is covered varies.
The distance of 1 degree at the Equator is the greatest, and at every next latitudinal line, north and south, the distance is becoming smaller, so on 45 degrees latitude it will be smaller, and on 90 degrees it will be the smallest. The reason as to why this is the case is because the Earth has elliptical shape, with the Equator being the most pronounced part of it, thus the widest, and the higher latitudes being more retracted, thus being less wide.
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