Travel Reference
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Figure A1: Impact of sun's altitude on energy density
2. Atmospheric absorption: A portion of the sun's light that is directed towards the
earth is absorbed by water vapor and other gases in the atmosphere. The lower the
sun in the sky, the longer the path light has to travel through the atmosphere and
the stronger the resulting absorption. At an altitude of 60°, increased atmospheric
absorption will reduce the solar power that reaches your solar panel by about 4%
compared to the sun being directly overhead. At an altitude of 30° this effect is
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