The initial prediction by Percival Lowell of Pluto's position was close to the place it was, in fact, found by Clyde Tombaugh in 1930.

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Percival Lowell's predictions, based on perturbations in Neptune's orbit, led to a search for Planet X. Although his calculations were not precise, the discovery of Pluto in 1930 by Clyde Tombaugh was relatively close to the region Lowell had predicted.

The Initial Prediction by Percival Lowell of Pluto's Position Was