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Earth is a ball shape and the light shine on earth hit earth. While earth is a ball of surface area 4.pi.R2 but earth is visible to sun as a circle with area Pi.R2. Visible area to Sun V.S. actual surface area is the key to different light intensity.

Picture the equator, light is most intense at the centre (most intense/area). At North or South pole, light is less intense since it is more surface area than visible area. So it was not heat-up evenly and so the temperature variation.

There are many more factor such as wind direction, geometry shape of terrain and water current add extra variation to global temperature as well.

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