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Jan Heweliusz was a Polish astronomer, a member of the Royal Academy, and councilor.
He studied law at the University of Leiden. In 1641, he built a well-equipped
observatory and constructed its instruments, then charted the lunar surface
in Selenographia (1647), catalogued in 1564 stars, observed sunspots, discovered
four comets and studied the phases of Saturn. A crater on the moon was
named in his honor.
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