On this day in 1620 - July 21st - French astronomer Jean Picard was born.
Picard collaborated and corresponded with many fellow scientists, including Isaac Newton, Christiaan Huygens, Ole Rømer, and Giovanni Cassini, among others. He was a founding member of the French Academy of Sciences.
On this day in 1972 - July 23rd - the US launched Landsat 1.
The near-polar orbiting spacecraft served as a stabilized, Earth-oriented platform for obtaining information on Earth resources of all kinds, meteorology, pollution, etc. Over the lifetime of the satellite it provided around 300,000 images.
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