The first picture of the Earth taken from a satellite orbiting the planet was stitched together from 40 images snapped on February 13, 1965. This picture looks vastly different from today's images.
The resolution these early images was crude as engineers continued to experiment with how to send data back to Earth. In today's world of high definition cameras, the level of details that can bee seen in the 1965 (top below) image versus an image from February 13, 2015 (bottom below) is noticeable at first glance. Not only is the older image black and white, but you can barely pick the outlines of the continents. No matter the resolution, this first image provided forecasters a glance into the future where global weather images are now a routine part of forecasting.
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