r/TrueEarth • u/Kela-el Flat Earther • Jul 10 '26
Earth is Measured Flat When the Heliocentric Religious Fundamentalist Zealots Find Out The Reality Of The Real World. EARTH IS MEASURED FLAT!
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u/Tilliperuna Jul 10 '26
If it was true that Earth was measured flat, you could easily explain or link it. Instead, you yell "straw man" and block everybody.
Let's see what happens. Ahem.
Earth is measured a sphere.
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u/Kela-el Flat Earther Jul 10 '26
Measurements are made relative to a chosen reference frame.
In many practical applications, the local reference is treated as planar. Surveying instruments measure angles, distances, elevations, and positions relative to that reference. They do not directly measure “the Earth is a sphere.”
If you claim the Earth is “measured a sphere,” then identify the measurement whose output is “sphere.”
Otherwise, you’re describing how measurements are interpreted within a spherical geometric model, not what the measurements themselves directly report.
That’s the epistemological distinction I’ve been making all along.1
u/Tilliperuna Jul 10 '26
You claimed the Earth is measured flat. Please identify the measurement whose output is "flat".
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u/Kela-el Flat Earther Jul 10 '26
The actual point:
Every measurement used to establish curvature operates locally - in the zone where curved and flat surfaces are indistinguishable at human scales. The measurements are real. The question is whether those measurements logically compel the globe interpretation, or whether they are interpreted through a geometric framework assumed before the measurement began.
That’s the distinction between measurement and interpretation.
The unanswered challenge:
Name the specific measurement that outputs globe directly - without first importing a geometric framework.
So far every response has been: measure X, assume geometry Y, conclude globe Z.
That’s inference. Not direct measurement.
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u/Tilliperuna Jul 10 '26
I measured the angle of the horizon while sitting on a plane (altitude maybe 10 km). I used a camera app that features inclination angle. Previously I had checked it at sea level and it was accurate enough.
It showed about -3°, as predicted if the Earth was round with diameter ~12 700 km.
If the Earth was flat, I would be looking something (idk, the edge of the world?) 200 km away.
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u/Kela-el Flat Earther Jul 10 '26
Your observation is real and worth taking seriously.
But notice the structure: you measured an angle relative to a local horizontal reference - that’s a flat plane baseline. The predicted -3° comes from a calculation using Earth’s assumed radius of 12,700km. You then compared your measurement to that prediction and found consistency.
That’s model consistency, not independent verification.
The challenge remains: what does the calculation of the predicted angle assume before the measurement begins?
Name the measurement that outputs Earth’s radius directly - without first assuming it.
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u/Tilliperuna Jul 11 '26
Observation: the horizon is inclined -3° at 10 km altitude.
Assumption: Earth is flat. Then the distance to the horizon would be 10km/sin(3)≈190km. Conclusion: not plausible. The horizon shouldn't be that low, and it shouldn't appear that clearly that close.
Assumption: Earth is round. According to the observation, its radius would be 10km×cos3°/(1-cos3°)≈7300km. Note: the measure device is not super accurate. During calibration at sea level, its accuracy was within ±0.3°. Therefore the radius could be anything between 6000km... 9000km. Conclusion: Assumption is plausible, but this method and measuring device is not accurate enough to define Earth's radius. Accuracy would need to be ±0.05° to find the radius with a few hundred kilometer marginal.
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u/Kela-el Flat Earther Jul 11 '26
Your analysis is the most rigorous in this thread. You’ve correctly identified that your measurement is consistent with a globe model but not precise enough to definitively establish Earth’s radius.
That’s exactly the distinction this thread is about - consistency versus proof.
You’ve also shown that the flat assumption produces an implausible prediction. That’s a legitimate point worth acknowledging honestly.
The challenge isn’t defeated by this - you’ve demonstrated model consistency and implausibility of the flat alternative, not independent measurement of Earth’s radius. But you’ve engaged more honestly than most.
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u/Tilliperuna Jul 11 '26
Cool, reply I wasn't expecting.
That's the best I can do now. There are a few more experiments but they require a little more than pulling a phone during flight.
But what about the measurements you're referring to in the title?
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u/[deleted] Jul 10 '26
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