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🧵 Untitled Thread

Anonymous No. 16629550

Was Eratosthenes wrong?

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Anonymous No. 16629560

>>16629550
probably not

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Anonymous No. 16629635

>>16629550
>the Sun's rays really are parallel, goyim

Anonymous No. 16629640

>>16629635
>clouds are two dimensional objects with regularly shaped holes
Heh.

Anonymous No. 16629662

>>16629550
My impression is that he made several large errors which serendipitously cancelled out, leaving him within about 4% of the correct figure

Anonymous No. 16629689

>>16629550
I don't remember my philosophy books but wasn't he only off by like 300 miles or something? And he only went from Cairo to some other Podunk Egyptian town? It's pretty impressive even if it is kinda lucky.

Anonymous No. 16629771

>>16629550
>Was Eratosthenes wrong?
Yeah he was so wrong that he actually calculated the size of the Earth within a small margin of error based on that shadow experiment.

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Anonymous No. 16629773

>>16629635
compelling

Anonymous No. 16629777

>>16629550
>>16629773
So the sun is actually just a few hundred meters up above Earth's surface?
That's what your graph implies, you dummy.

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Anonymous No. 16629780

>>16629777
trips of truth

Anonymous No. 16629826

>>16629550
another flat earth thread. shills on the rampage.

Anonymous No. 16629827

Reminder that flat earth is an artificially promoted psyop to make you associate all conspircy theories with their paid clowns and lunatics.
So instead of real documented conspiracies corporate and governmental corruption, or how the field of science is completely perverted by gatekeeping journals some flat earther will be promoted with these same views to smear shit over them.

The ancient greeks proved the world wasn't flat why? Because the phoenicians were using flat earth as a tool to maintain a maritime trade monopoly with people fearing to go out too far they'd fall off the edge.

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Anonymous No. 16629847

>>16629773
>OnceYouGoFlat
YouNeverGoBack

Anonymous No. 16629874

>>16629827
I wonder how much they are paid to shill their nonsense on /sci/.

Anonymous No. 16629904

>>16629550
Next time you use a GPS apologize for this post.

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Anonymous No. 16630474

>>16629662
>(((serendipitously cancelled out)))

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Anonymous No. 16630484

>>16629773
ok I'll bite, nigger

from Cleomedes’ account (On the Circular Motions of the Celestial Bodies, Book 1, Chapter 10), Eratosthenes measured:

- At Syene (modern Aswan), on the summer solstice at noon, the Sun was directly overhead, casting no shadow (angle of incidence = 0°).

- At Alexandria, 5,000 stadia north of Syene, a gnomon (vertical stick) cast a shadow with an angle of 7.2° from vertical at the same time.

- Eratosthenes assumed these locations were on the same meridian (north-south line), and the distance of 5,000 stadia was measured along the Earth’s surface.

For this model:
- The Earth is a flat plane.
- The Sun is a local point source of light at some height h above the plane.
- The 5,000 stadia is a straight-line distance on the flat Earth between Syene and Alexandria.
- The 7.2° angle is the angle between the Sun’s rays and the vertical at Alexandria.

Imagine a right triangle:
- Vertex at Syene (S): Directly under the Sun, where the rays are vertical.
- Vertex at Alexandria (A): 5,000 stadia away from Syene along the flat Earth.
- Vertex at the Sun (Sun): At height h above Syene.


In this model:
- The distance SA = 5,000 stadia is the horizontal base of the triangle
- The height h is the vertical leg (perpendicular to the flat Earth, directly above Syene).
- The angle at Alexandria between the vertical (a gnomon) and the Sun’s rays is 7.2°, which corresponds to the angle between the hypotenuse (line from Alexandria to the Sun) and the vertical
- At Syene, the Sun is at 90° to the surface (directly overhead).
- At Alexandria, the shadow angle of 7.2° from vertical means the Sun’s rays hit the gnomon at an angle of 90° - 7.2° = 82.8° from the horizontal surface.

If Eratosthenes’ measurements were interpreted on a flat Earth with the Sun as a local point source, the Sun would be calculated at a height of about 631.5 stadia (roughly 99.5 km) above ground, which is patently absurd.

fuck off with this shit nigger

Anonymous No. 16630486

>>16630484
is the guy alright or did ehe died?

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Anonymous No. 16630562

>>16630484
99.5 km looks about right

Anonymous No. 16630674

>>16629550
>Was Eratosthenes wrong?
flat Earthers are

Anonymous No. 16630707

>>16630562
>still pretending clouds are two dimensional with regular holes

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Anonymous No. 16630799

>>16630562
obviously closer

Anonymous No. 16630802

>>16629550
These only yield the same solution for small angles about 0 - if you work out the solution for larger latitudes the solutions diverge. The close sun model also completely ignores the effect of the inverse square law on the intensity of the light.

Anonymous No. 16630812

>>16630802
along with the fact that the suns motion (and hte moons of course) across the sky doesnt change at all, all day, anywhere on the planet.

Anonymous No. 16630813

>>16630484
It's just a model bro. They should use Polaris' altitude angle in the story.

Anonymous No. 16630819

>>16630813
if you do that then it turns out that Polaris is between 87-40km above the north pole, depending on how accurate you can get with the elevation angle. i guess thats the highest point of the dome?

can we finally get a number for how high the dome is?

Anonymous No. 16630912

flers absolutely running from this one simple fact >>16630819

Anonymous No. 16631049

Earth is round
Jarth is flat

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Anonymous No. 16631353

>>16630484
>so the local sun is 99.5 km above the earth during the summer solstice, which is the highest it will go
thanks trignanon! i wonder what it's height is during the winter solstice, probably between 40-87 km as the glowie pointed out

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Anonymous No. 16631562

>>16630484
Assuming the sun is small and local, what is possibly powering it?

Anonymous No. 16631592

>>16631562
Thunder clouds. It's ball lightning.

Anonymous No. 16631667

>>16631353
>probably between 40-87 km as the glowie pointed out
Thats polaris, not the sun. are you wanting to say the dome is that high?

Anonymous No. 16631682

>>16630474
go back to pol

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Anonymous No. 16631719

>>16631562
Tesla claimed the sun was powered electromagnetically by the giant magnetic mountain at the north pole and studying the sun's movements would grant you the ability to scale down the design to generate power locally ie. instead of tapping the sun you tap the power source that powers the sun

sounds like a bit of a stretch

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Anonymous No. 16632036

>>16629773
Both neglect refraction.

Anonymous No. 16632037

How do people, presumably on this earth for more than 18 years at least, not know how god rays work?
You can literally go experiment by walking from one to another and watching the perspective shift so nearby ones always point to the sun, in parallel.
>but the train tracks actually get close together and touch at the end

Anonymous No. 16632573

>>16632037
had one nearby yesterday evening. amazing how long the shadows are.

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Anonymous No. 16632589

>>16629635
>>16629773
GUYS LOOK, THE ROAD GETS NARROWER THE FURTHER AWAY IT IS!!!

WE ALL HAVE BEEN LIED TO!!!!!!!!!!!!!!!!!!!!!!

Are you guys 79IQ retarded?

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Anonymous No. 16632590

>>16632589
THE SUN IS CLOSE!!!1

LOOK HOW CLOSE IT IS!!!!1

ITS RIGHT BEHIND THE TREES!!!11

Anonymous No. 16632645

>>16629560
that's a submarine

Anonymous No. 16632667

>>16629773
Has a flat earth theorist made a model that doesn't contradict itself?

Anonymous No. 16632699

>>16630484
>the Sun would be calculated at a height of about 631.5 stadia (roughly 99.5 km) above ground, which is patently absurd.
Anon, flatties literally believe the Sun is a relatively small ball traveling through Earth's upper atmosphere or something.

Anonymous No. 16632737

>>16629550
No, flat earthers who hate White scientific heritage should go to Darkest Africa to live with their intellectual equals.

Anonymous No. 16632753

>>16632589
its very sad frankly. they have more access to information than all of their ancestors and choose to be ignorant.

>>16632699
i feel like this would be super easy to prove, no?

take a picture of the sun and measure the apparent 2 dimensional area of it. then hop on a plane or attach it to a rocket and do the same thing with the same camera settings. if the sun is local, you should see a substantial increase in the area

just a random thought i had, no idea if decreased atmosphere would play a part. but i imagine we should expect to see 0 increase in area if the sun is 100 million miles away, and a large increase if its only 100 miles away. it looks like "amateur" rockets have gone as high as 90 miles

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Anonymous No. 16632772

>>16632753
so far as the sun goes, you can just let it get closer to you and then farther away. on a flat earth it would move many times closer to you compared to its original distance on the other side of the disk, and then go away again. its apparent size would vary greatly. But in reality it doesn't

Anonymous No. 16633193

>>16632772
I actually haven't measured the angular size of the sun across the course of a day, and it's way too bright to get an accurate feel for it in every day experience

Anonymous No. 16633211

>>16633193
try using the appropriate filter and exposure and it wont be so tricky

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Anonymous No. 16633216

>>16633193
If only we had a celestial body that wasn't as bright...

Anonymous No. 16633221

>>16633211
obviously as an actual measurement to take it won't be difficult, I'm just saying that it's not one you can do with the mk 1 eyeball while jacking off, you need a filter at least

Anonymous No. 16633229

>>16633221
Welding glass is pretty cheap

Anonymous No. 16633233

>>16633229
yeah it's a piss easy observation to make and every science teacher should do it with their class but it's not something that somebody is just going to do

Anonymous No. 16633259

>>16633233
True. An even cheaper way to measure the sun's angular size is to use a pinhole camera.

Anonymous No. 16633315

>>16629550
Flatt eartherz think that a torpedo launched from a submarine travels in an absolute perfect flat straight line trajectory horizontally and vertically, and that if the earth was a round sphere, the torpedo would eventually hit the curve of the water surface, exit the water and continue on a straight flat trajectory through the air and out into space. Lol.
They say because this doesn't happen, that proves flat earth flat oceans, and so on.
Lol

Anonymous No. 16633338

>>16629689
Alexandria to Syene.
Cairo wouldn't exist for another 1200 years or so. It's deceptively young for Egypt

Anonymous No. 16633339

>>16631682
Go seek some Canadian healthcare my dude.

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Anonymous No. 16633441

>>16632772
>>16633193
>>16633221
>on a flat earth with a local sun it's angular size would vary over the day and it would get smaller as it goes farther away

you mean like this?
youtube.com/watch?v=bRTUo2l6_YE
youtube.com/watch?v=IUmhLaYPrX0
youtube.com/watch?v=qtcv0VWYq_U

with solar filter
youtube.com/watch?v=OIpI0iaso5I

inb4 refraction

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Anonymous No. 16633506

>>16630474

Anonymous No. 16633623

>>16633441
Funny how the video with the solar filter on proves it's just a camera lighting issue.
The sun doesn't get smaller when you have the filter on.

Furthermore, you can do the same experiment with the moon instead of the sun, which would work better since it's not as bright, and as this guy shows >>16633216
It's the same issue.
The sun and moon don't become smaller as they approach the horizon.

Also the Flat Earth model says the Sun should never go down past the Horizon, since the Earth is supposed to be flat, so night should never fall upon us, because even if the sun is far away, it's still above the horizon, which we should be able to see if the Earth was flat, except we don't.

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Anonymous No. 16633627

>>16633623
Checkmate

Anonymous No. 16633665

>>16633627
Kek, you got me.

Anonymous No. 16633671

>>16629550
Depends on how fat you are.

Anonymous No. 16633675

>>16629550
>Was Eratosthenes wrong?
no

Anonymous No. 16633684

>>16633627
Valheim.png

Anonymous No. 16633711

>>16633441
are you stupid?

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Anonymous No. 16633758

>>16633623
shalom

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Anonymous No. 16633759

>>16633623
kek jew shill being a jew

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Anonymous No. 16633762

>>16633623
>it's just a (((camera lighting issue)))

Anonymous No. 16633782

>>16633758
>>16633759
>endless schizo babble
>refuses to discuss anything
typical flat earther

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Anonymous No. 16633823

https://www.youtube.com/watch?v=q4nR4rxVnUw

How can a rocket pass into earths shadow if the earth is flat has cast no shadow?

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Anonymous No. 16633827

>>16633823
And how can satellites enter earth's shadow at exactly the time they were predicted to?
This is my personal video of 4 geostationary satellites that I shot back in 2020.

Anonymous No. 16633832

>>16633823
>has cast no shadow?
*AND
goddammit

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Anonymous No. 16633922

>>16633758
>>16633759
>>16633762
>Retards/Schizos claim that ancient Jews thought the Earth was round.
LOL, LMAO EVEN!
>Talmudic sources sometimes describe the Earth as flat or disk-shaped. For instance, Talmud Pesachim 94b discusses a debate about the sun's movement, with some sages implying a flat Earth concept
AHAAHAHAAHAHAA
Want more?
>Some passages in the Torah and other Jewish texts have been interpreted to suggest a flat Earth. For example, references to "the four corners of the earth" (Isaiah 11:12, Ezekiel 7:2) and "pillars of the earth" (Psalm 75:3) are often cited by flat-earth proponents.
FLAT EARTH = JEWISH
Cope and Seethe retards!!!!

>>16633782
>>endless schizo babble
>>refuses to discuss anything
>typical flat earther
Also this.
Funny how they're quick to throw around Ad Hominems and accusations of Judaism, yet refuse to even formulate an argument.

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Anonymous No. 16634258

>>16633441
daaamn it does get smaller

Anonymous No. 16634986

>>16634258
no it doesn't

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Anonymous No. 16635509

>>16633827
I got bored and decided to simulate the satellites in Stellarium.

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Anonymous No. 16635514

>>16633827
>>16635509
And here's their trails.
Left side is reality and right side is Stellariums prediction using their respective TLE files.
The gaps in the curve is when the satellites were in shadow.

Anonymous No. 16635554

>>16629689
And he had to do it on a specific day of the year so the sun was directly overhead. How do you even figure that shit out back then

Anonymous No. 16635557

>>16633315
Makes sense tho

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Anonymous No. 16635614

>>16630484
>eratosthenes proved the sun is 99.5 km away

eratosthenes is a jewish psyop created to disprove the conclusion that the sun is a small and local point source of light

Anonymous No. 16635617

if you're in here voluntarily arguing with flat earthers, you're probably too stupid to actually prove the earth is round

Anonymous No. 16635974

>>16635554
>. How do you even figure that shit out back then
they had calendars and stuff

>>16635617
you try it then Professor Genius

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Anonymous No. 16637262

>>16635509
The videos side by side. I had to botch the quality though.

Anonymous No. 16638781

>>16630799
>>16632590
LTL on a planet where I can just jump a little and touch the sun!

Anonymous No. 16638783

>>16633627
Ra was great in this otherwise shitty movie.

Anonymous No. 16638846

>>16632699
>flatties literally believe
nope. they are all just pretending because muh epic troll.

Anonymous No. 16638847

>>16629550
daily reminder in a daily troll thread that the Eratosthenes experiment was meant to measure the size of the globe. scientists back then knew by other means that the Earth was a globe.

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Anonymous No. 16639415

>>16635614
the shills hate you because you speak the truth. they keep showing up with muh models & simulations simply to gaslight you into not trusting easily observable empirical truths

Anonymous No. 16639547

>>16639415
how far away is the horizon? how much does the globe curve over that distance? why can you not understand scale?

Anonymous No. 16639555

>>16639547
7km at ground level= 0-100 meters above sea level
0 curve
arkansas is flatter than a pancake
arkansas 386km x435km
no curve.
extrapolate.
why can't you understand that: if y consists of x1, x2, x3...xn and all of these are flat then y is flat. y being earth btw.

Anonymous No. 16639556

>>16638847
>fails to provide other means
>fails to understand erssthostenes extrapolation is made on assumption of world already being round. By definition is not a proof.

Anonymous No. 16639560

>>16639555
>0 curve
nope not quite. the globe curves at a rate of 0.0145 degrees per mile. Its very flat over such a short distance as 7km which is why those dumb memes talking about how the suns reflection 'proves da flat' are dumb.

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Anonymous No. 16639564

>>16633827
>>16637262
At one point the star Theta Ceti passed really close to the satellite group.

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Anonymous No. 16639565

>>16639564
If we look up the declination of that star we can see that it's 8° south of the celestial equator.
Due to parallax, geostationary satellites appear south of the celestial equator when you are in the northern hemisphere and north of it if you're in the southern hemisphere. If you're on the equator the satellites sit right on the celestial equator.

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Anonymous No. 16639566

>>16633922
>Jews were flat Earthers

Real. And to add to this, Why are the anons who are supposedly against Semitic deception on this thread, degrading the European discovery of a round Earth, in favor of the kike conception of the "flat Earth"? The world may never know.

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Anonymous No. 16639567

>>16639565
>If we look up the declination of that star we can see that it's 8° south of the celestial equator.
I live at around 60° north latitude and if we make a scale model of it all we can see that geostationary satellites should be around 8° south of the celestial equator.
Everything is in order.

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Anonymous No. 16640113

>>16639415
>round earth and gravity is european discovery
>isaac newton
>(((isaac)))

Anonymous No. 16640417

>>16640113
>is unable to grasp how Biblical names were adopted by Christians
typical flerf

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Anonymous No. 16641485

>>16631353
Flat earthers fear the analemma.

Anonymous No. 16642321

>>16641485
don't fear the anal,emma

Anonymous No. 16642741

>>16629550
https://youtu.be/5lcIGOyL4zs?
https://youtu.be/oHbMj3jDjaY?
https://youtu.be/Anz6a5Ik98g?
https://youtu.be/TiUwvQTA4K0?

Anonymous No. 16642757

>>16633441
>what is exposure
Are you 49IQ retarded?

Anonymous No. 16642759

>>16633627
Why can't I see the noon at the same time on every place in the globe then? Why is it dark at the same time somewhere else?

Anonymous No. 16642917

>>16629635
a pespective denier has entered the chat.

Anonymous No. 16642924

>>16630484
>which is patently absurd.
by whom?
it's impossible for humans to accurately estimate the altitude of anything in the sky

Anonymous No. 16643025

>>16629874
Likely nothing. A small percentage of flat earthers are actual believers but what we get here are mostly attention seekers whose only outlet for human interaction is acting stupid. There might be the occasional paid poster who has a list of hundreds of sites to seed with outlandish conspiracy theories but most are likely doing it for reasons other than money.

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Anonymous No. 16643681

>>16641485
Here's a video I put together demonstrating how the orientation of the analemma changes depending on your latitude.

https://www.youtube.com/watch?v=mqY7TV_5pLg

This only makes sense on a globe and you might as well have downs syndrome if you can't see it.

Anonymous No. 16644120

>>16643681
flatfucks are just going to ignore this

Anonymous No. 16644129

>>16632753
You don’t get how flat earth works, anon. They are completely committed. They make up crazy middle school science fair projects, and call them experiments. Usually these don’t demonstrate anything, but when they do contradict flat earth, they just say “refraction”, or “density”, or they say they need to rerun (change) the “experiment”.

Your idea is in general way too thought out. And many who are capable of such a thing are actually smart enough to smell when an experiment would contradict their model. It’ll never happen.

Anonymous No. 16644372

>>16635554
Lots of time and not much to fill it with.