Balloon footage feels direct and personal, and the expected curvature can still be subtle in some camera setups.
Debunk
Weather Balloons Show A Perfectly Flat Earth
High-altitude balloon footage shows a flat horizon, so Earth cannot be curved.
Why It Sounds Convincing
Calculation or Model
Apparent horizon curvature in a frame depends on altitude, focal length, crop, and lens distortion. Wide-angle lenses can bend or flatten the horizon dramatically.
Proof and Observation
- Different cameras on the same flight can make the horizon look straighter or more curved.
- The visible arc at balloon altitude is still modest compared with what many people imagine.
- Measured horizon distance and dip still track height predictably.
Graphic
Compare the same high-altitude horizon under narrow-angle and wide-angle lens models with the expected dip called out.
Wide-angle views hide subtle dip; geometry still predicts bottom-first hiding.
Evidence Card
Claim
High-altitude balloon footage shows a flat horizon, so Earth cannot be curved.
Model Used
Curved-surface geometry checked against the claim.
Formula
Apparent horizon curvature in a frame depends on altitude, focal length, crop, and lens distortion. Wide-angle lenses can bend or flatten the horizon dramatically.Last Verified
2026-03-23
Assumptions
- The page compares the claim with a stated physical or geometric model rather than slogans.
- Observations must be repeatable under the same assumptions.
- Primary-source references carry more weight than generic summaries.
External Sources
A page-specific source set has not been attached yet.
What Would Falsify This Page
A repeatable observation or model that matched the claim while contradicting the page’s stated assumptions would count against this page.
Sources
- External source links will be added before final release: This debunk is still in beta, so the source list is currently a placeholder.
Conclusion
Balloon footage is camera-dependent and does not overturn measurable horizon geometry.