How did Neptune discoverers find the planet without seeing it first?
Quick Answer
They predicted Neptune's position from irregularities in Uranus's orbit and then observed it near the predicted spot in 1846.
The Full Story
In the 1800s, astronomers noticed Uranus was not exactly where it should have been according to calculations. Two mathematicians, Urbain Le Verrier in France and John Couch Adams in England, independently worked out that another planet's gravity could be disturbing Uranus. Their predictions led Johann Gottfried Galle and Heinrich d'Arrest to observe Neptune on 23 September 1846, very close to the predicted location. It was a major triumph of mathematical astronomy.
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