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Free-view motion parallax of the Earth as seen from L1 by the Earth Polychromatic Imaging Camera onboard the DSCOVR spacecraft

Credit: NASA EPIC Team DSCOVR

"EPIC (Earth Polychromatic Imaging Camera) is a 10-channel spectroradiometer (317 – 780 nm) onboard NOAA’s DSCOVR (Deep Space Climate Observatory) spacecraft. EPIC provides 10 narrow band spectral images of the entire sunlit face of Earth using a 2048x2048 pixel CCD (Charge Coupled Device) detector coupled to a 30-cm aperture Cassegrain telescope (Figure 1)."

"The DSCOVR spacecraft is located at the Earth-Sun Lagrange-1 (L-1) point giving EPIC a unique angular perspective that will be used in science applications to measure ozone, aerosols, cloud reflectivity, cloud height, vegetation properties, and UV radiation estimates at Earth's surface."

"The EPIC instrument has a field of view (FOV) of 0.62 degrees, which is sufficient to image the entire Earth, which has a nominal size of 0.5 degrees. Because of the tilted (Lissajous) orbit about the L‐1 point, the apparent angular size of the Earth changes during the 6-month orbital period from 0.45 to 0.53 degrees."