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the claim

Neptune was the first planet discovered by mathematical prediction.

the verdict
INSUFFICIENT LEANING
Recorded sources
2 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Neptune was the first planet discovered by mathematical prediction?

Unclear. Two sources describe Neptune being found at a position calculated from perturbations in Uranus's orbit, supporting that it was discovered by mathematical prediction. Neither source states that it was the first planet so discovered, so the 'first' element of the claim is not covered.

Verdict: PARTIAL LEAN · 2 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
Neptune
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Neptune. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Neptune

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More for · 1
175 Years Ago: Astronomers Discover Neptune, the Eighth Planet - NASA
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175 Years Ago: Astronomers Discover Neptune, the Eighth Planet - NASA. (n.d.). nasa.gov. https://www.nasa.gov/history/175-years-ago-astronomers-discover-neptune-the-eighth-planet/

Receipt History
held for human review18 Oct 2026
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