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Loading contentFrom tiny irregularities in the orbit of Uranus, Le Verrier (and, independently, John Couch Adams) predicted an unseen planet; Galle found Neptune within a degree of the prediction on 23 September 1846.
A planet discovered 'at the tip of a pen' — a spectacular confirmation of Newtonian gravity.
Facts on this topic will be cited from these primary and reference sources.
General reference for the history of astronomy, biographies, and cultural context.
Official naming, definitions, constellation boundaries, and astronomical nomenclature.