We have known for thousands of years the earth is a sphere! RIght?

Sama_El
Published on Jul 5, 2024
We have known for thousands of years the earth is a sphere!
RIght?
....
Right guys?
Do you know HOW some guy 2000 years ago proved the shape of the earth?

https://publish.obsidian.md/shanesql/The+Circumference+of+WHAT%2C+though

Well...what actually happened was someone measured the CIRCUMFERENCE of our VISIBLE RADIUS. And told everyone with zero evidence that this applied to the physical globe earth that we stood on.... when it would be optically identical in either case.

This circumference is all that has EVER been measured, but the real question is,

THE CIRCUMFERENCE OF WHAT?

The physically curving ground that you have never seen and has never been measured by any human, ever. period.
OR....
The naturally curving celestial hemisphere?

Which, again, residents of both models agree is inherently curved, and both treat it as such.

It seems the circumference of the circle gets repeatedly measured, but how, in any of these instances, could you differentiate it being the circumference of a planar circle inside a sphere, or the circumference of the visible radius around you into the celestial heaven the same amount in every direction? [Which is also supported by Angular Resolution limit/aperture/wavelength of light/ diameter arguments for an optically curving planar earth]

one from the other from inside?? (See animation below)

What about that measured angle of the light would be different in a spherically curving earth, or an optically curving planar one?

Well there goes the whole basis for the globe !

"What!? You don't subscribe to the theory that 2000 years ago some dude assumed parallel light rays (against every observation) made a measurement of the angle of the sun, made a comparison to a known distance between two cities, then used the angle of the second observation to conclude THE WHOLE WORLD IS TILTED
D AT 23.4 Degrees? Since light beams from the sun that appear crepuscular are simply a trick that make it appear as if they aren't parallel.

Eratosthenes, a Greek astronomer, and mathematician, measured the circumference of the Earth around the 3rd century BC. His method involved measuring the angle of the sun's rays at two different locations at the same time. Here's a step-by-step explanation:

Understanding the Setup:

Eratosthenes used two cities: Alexandria and Syene (modern-day Aswan), which are approximately 800 km apart.
He observed that at noon on the summer solstice in Syene, the sun was directly overhead (no shadow cast), while in Alexandria, it cast a shadow, indicating the sun was at an angle.
Measurement of the Angle:

In Alexandria, he measured the angle of the shadow, which was 7.2 degrees. This angle is the central angle corresponding to the arc of the Earth's surface between the two cities.
Calculating the Fraction of the Earth's Circumference:

The 7.2 degrees is 1/50th of a full circle (since 360 degrees / 7.2 degrees = 50).
This means the distance between Alexandria and Syene (800 km) represents 1/50th of the

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