Radius of earth

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Radius of earth
« on: March 24, 2019, 04:18:47 PM »
Hi everyone,

In the disc model of FE, what is the proposed radius of Earth? I think I read 3000 miles / 5000 km somewhere, is that correct?

Also, what is the best FE map available? Links?

Thanks in advance

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rabinoz

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Re: Radius of earth
« Reply #1 on: March 24, 2019, 05:55:49 PM »
Hi everyone,

In the disc model of FE, what is the proposed radius of Earth? I think I read 3000 miles / 5000 km somewhere, is that correct?
Quote from: The Flat Society Wiki
The Ice Wall
The figure of 24,900 miles is the diameter of the known world; the area which the light from the sun affects. Along the edge of our local area exists a massive 150 foot Ice Wall.
Which would make the radius of the known world 12,450 miles.

Quote from: notadisc
Also, what is the best FE map available? Links?

Thanks in advance
There is little in "the Wiki" on "maps".
If you look in the thread, "Flat Earth FAQ - Please Read", at the top of the page the third post in that has a section "Geography and Physics" containing: 
Quote from: Jack
Flat Earth FAQ - Please Read! « Reply #1 on: December 13, 2008, 05:24:52 PM »
What does the earth look like?
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The earth is surrounded on all sides by an ice wall that holds the oceans back. This ice wall is what explorers have named Antarctica. Beyond the ice wall is a topic of great interest to the Flat Earth Society. To our knowledge, no one has been very far past the ice wall and returned to tell of their journey. What we do know is that it encircles the earth and serves to hold in our oceans and helps protect us from whatever lies beyond.

Here is picture of a proposed, but certainly not definitive, flat earth:

There is also:
Here is the correct bipolar map (Piri Reis map):



Re: Radius of earth
« Reply #2 on: March 24, 2019, 06:33:40 PM »
Thanks Rabinoz!

Found this page on the Wiki,
http://www.theflatearthsociety.org/tiki/tiki-index.php?page=Eratosthenes+on+Diameter

It mentions 12,500 nautical miles ...

Is your figure also nautical miles?

Also, what is the “bi-polar” map, it looks more like a traditional globe map ie with the Antarctic as a continent but i thought the FE idea was the Antarctic is around the whole circumference. Can you clarify?

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rabinoz

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Re: Radius of earth
« Reply #3 on: March 24, 2019, 07:37:29 PM »
Thanks Rabinoz!

Found this page on the Wiki,
http://www.theflatearthsociety.org/tiki/tiki-index.php?page=Eratosthenes+on+Diameter
It mentions 12,500 nautical miles ...

Is your figure also nautical miles?
No. They both should be "statute miles".
Quote from: The Flat Earth Society Wiki
Eratosthenes on Diameter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
We can use Eratosthenes' shadow experiment to determine the diameter of the Flat Earth.

Syene and Alexandria are two North-South points with a distance of 500 nautical miles. Eratosthenes discovered through the shadow experiment that while the sun was exactly overhead of one city, it was 7°12' south of zenith at the other city.
By sheer math, 7°12' makes a sweep of 1/25th of the FE's total longitude from 90°N to 90°S (radius).
Therefore we can take the distance of 500 nautical miles, multiply by 25, and find that the radius of the Flat Earth is about 12,250 nautical miles. Doubling that figure for the diameter we get a figure of 25,000 miles.

The earth is physically much larger, of course. A circle with a diameter of 25,000 nautical miles across is simply the area of land which the light of the sun affects, and represents the area of our known world.
I would assert quite strongly that the "nautical miles" in the above Wiki entry is incorrect.
If you want to be precise,  Alexandria (at 31.2001° N, 29.9187° E) is not quite due north of Aswan (at 24.0889° N, 32.8998° E).
The slant distance is 843.4 km but the North-South distance is 790.7 km and the latitude difference is 7.11°.
The end result turns out right with a diameter of 40,029 km or 24,873 statute miles.

This rounds to the 24,900 miles for the diameter of "known earth" in "the Wiki".

So, I'm sure the "nautical miles" in the "Eratosthenes on Diameter" is a simple mistake.

Quote from: notadisc
Also, what is the “bi-polar” map, it looks more like a traditional globe map ie with the Antarctica as a continent but i thought the FE idea was the Antarctic is around the whole circumference. Can you clarify?
I'll let sandokhan or Tom Bishop, who supports a similar map, handle that.

Re: Radius of earth
« Reply #4 on: September 04, 2019, 02:40:45 AM »

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rabinoz

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Re: Radius of earth
« Reply #5 on: September 04, 2019, 03:09:30 AM »
SCALING THE EARTH https://docsbay.net/scaling-the-earth-a-sensitivity-analysis-of-terrestrial-exoplanetary-interior-models mentions 12,500 nautical miles ...
That is very close to half the diameter in:
This rounds to the 24,900 miles for the diameter of "known earth" in "the Wiki".