Energy from the Sun reaching the Earth drives almost every known phisical and biological cycle in The Earth system the energy that keeps the earth's surface warm originates from the sun. the primary source of energy to drive our global climate system (incluiding atmospheric and, to a lesser extent, oceanic circulation) is the heat we recieve from the Sun, termed solar insolation. The amount of insolation which reaches the Earth's surface depends on site latitude and season. The insolation into a surface is largest when the surface directly faces the sun. As the angle increases between the normal directionl to surface and the direction of the rays of sunlight, the insolation is reduced in proportion to the cosine of the angle.
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