Quiz | Easy like Sunday morning: Space and beyond
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Born this day in 1620, Jean Picard was a French astronomer who conducted an arc measurement survey in 1669 by measuring one degree of latitude along the Paris Meridian using triangulation along 13 triangles stretching from Paris to the clocktower of Sourdon. He became the first person to accurately measure what we now know is 51,00,72,000 km2. What did he measure?