what is atmospheric ref raction?
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Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through theatmosphere due to the variation in air density as a function of height. ... Astronomical or celestial refraction causes astronomical objects to appear higher in the sky than they are in reality.
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Reflection is the process by which "a surface of discontinuity turns back a portion of the incident radiation into the medium through which the radiation approached." Reflection is important to take into account since about a third of the energy from the sun is reflected.
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