Claim: Is it true that the earth is flat?

First requested: January 23, 2025 at 10:31 PM
Last updated: April 8, 2026 at 9:13 AM
6%

IsItCap Score

Truth Potential Meter

Not Credible

AI consensusMedium

Grader consensus is moderate.
Range 1%–12% (spread Δ11).
The graders lean in the same direction but differ on strength. Skim the summary and sources.
Read analysis summary

OpenAI Grade

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Perplexity Grade

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Google Gemini Grade

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Analysis Summary

Based on our comprehensive analysis, the claim that the Earth is flat is definitively false. The scientific consensus and evidence overwhelmingly support Earths spherical shape. Key findings include the role of gravity in forming Earth into a sphere and experiments like Foucaults pendulum that demonstrate Earths rotation. Mainstream sources consistently provide robust evidence against a flat Earth, while conflicting sources often rely on unverified claims and interpretations that diverge from scientific consensus.

The evidence supporting this conclusion is multifaceted, including historical scientific proofs by figures like Eratosthenes and modern observations such as the visibility of curvature from high altitudes and the changing constellations during flights. Mainstream sources like UNLV News and Reasons to Believe provide detailed explanations of…

Source Analysis

Mainstream Sources

Publication

Title

Round Earth Clues: How Science Proves that our Home is a Globe

Summary

Source details

Publication

Title

Is There Scientific Evidence for a Flat Earth?

Summary

Source details

Alternative Sources

Publication

Title

Why do some people believe the Earth is flat?

Summary

Source details

Publication

Title

Square Earth - Flat earthers for the Internet age

Summary

Source details

Analysis Breakdown

How to read the breakdown

  • Truth: how well sources support the core claim.
  • Source reliability: whether the sources have a strong track record.
  • Independence: whether coverage looks one-sided or recycled.
  • Context: missing details (timeframe, definitions, scope) that change meaning.
  • Tip: if graders disagree, rely more on the summary + sources than the single number.

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Methodology