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Discovery of Neptune

The planet Neptune was mathematically predicted before it was directly observed. With a prediction by Urbain Le Verrier, telescopic observations confirming the existence of a major planet were made on the night of September 23-24, 1846, at the Berlin Observatory, by astronomer Johann Gottfried Galle (assisted by .

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Project Gutenberg is a volunteer effort to digitize and archive cultural works, such as books and texts, in order to make them freely available to the public.