Why there is no higher latitude than 90 degree N and 90 degree S?

A bit explanation.

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The answer to your question involves simple Euclidean Geometry. The Earth is round (more or less) therefore if viewed on a flat surface, its form would be a circle. A circle is comprised of 360 degrees. The Equator, which divides the world North and South, is at the mid point of that circle, so this divides the circle into two halves of 180 degrees each. In measuring latitude, one begins at the Poles, which are at zero degrees and 180 degrees, similar to the Equator, only they are drawn at right angles to the Equator itself. A line from the North Pole to the South Pole, will, with the Equator, divide the world into four equal parts, each of which will be 90 degrees on the arc created. So, if one measures from the North Pole at zero degrees to the Equator, one measures 90 degrees. Again, when one measures from the South Pole at 180 degrees to the equator, one again measures 90 degrees. If we treat the Equator as zero degrees latitude, then the distance (or angle) to each pole is 90 degrees. North or South depends on the direction in which one is moving. Hope this helps.

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