Johann Gottfried Galle 1812 1.) He was the first person with his student to view the planet neptune. 2.) He discovered 3 new comets. 3.) He came up with a new method to measure the solar parallax (jan 1, 1812 – jun 5, 1819)
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Date:
jan 1, 1812
jun 5, 1819
~ 7 years and 5 months