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Solar irradiance is the measurement of the Sun's energy reaching the top of Earth's atmosphere at a mean distance at one moment in time. Solar irradiance, also known as the solar constant, is often used to calibrate visible-light band instruments aboard Earth-observing satellites. NASA has an assortment of solar irradiance data, including hourly images from the Earth Polychromatic Imaging Camera (EPIC) aboard the Deep Space Climate Observatory (DSCOVR) stationed at the L-1 Lagrange point.
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