[rabinoz]

There have been a number of threads on Geodetic Surveyors and how they "prove the earth is a Globe". So many "shot them down" saying that Geodetic Surveyors did not "prove curvature", possibly not, but as I have stated so often Geodetic Surveyors measured the earth and have done so with increasing accuracy for centuries. The sizes of all countries and the lat/long coordinates of all features have been measured and can readily be ascertained. The most compact source of this information is in maps (some very accurate, others less so) and atlases (often not very accurate, but usually quite close enough).

And it is these measurements that show us the "shape of the earth".

The following assumes that at a given latitude, a degree of longitude is the same all around the globe.

This seems quite consistent with all evidence^[1] and with what is in "the Wiki" on Finding your Latitude and Longitude.

The following table gives the width of one degree (under the heading "km/deg") at various latitudes in both the northern and southern hemispheres, the circumference of the earth (the distance for 360°) from the map reading at each latitude, the circumference at that latitude based on a spherical earth (yes, I know it's not a perfect sphere!) and the circumference at that latitude based on a Flat Earth Ice Wall Map.

The "Flat Earth Circumference @ Latitude" is based on the 24,900 mile overall diameter of the "known earth" as in the Wiki, The Ice Wall. The circumferences are then simple "pro-rated" as the meridians on the "FE Ice Wall map" are simply radial lines.

Latitude		km/deg @ Lat		Map Circum@Lat		Ideal Globe Circum@lat		Flat Earth Circum@lat		Source of "map data"
51.0°		70.3 km/deg		25,300 km		25,200 km		27,400 km		US 1887 map
43.0°		81.7 km/deg		29,400 km		29,300 km		33,000 km		US 1887 map
35.0°		91.4 km/deg		32,900 km		32,800 km		38,600 km		US 1887 map
0.0°		109.7 km/deg		39,500 km		40,100 km		63,200 km		Times Atlas map
-20.0°		102.1 km/deg		36,700 km		37,700 km		77,200 km		Times Atlas map
-34.0°		92.0 km/deg		33,200 km		33,200 km		87,100 km		1855 Australian map
-45.0°		79.2 km/deg		28,300 km		28,300 km		94,800 km		Times Atlas map
-55.0°		65.5 km/deg		23,600 km		23,000 km		101,800 km		Times Atlas map

The 1887 US survey map and the 1855 Australian map are very high resolution accurate maps, but the Times Atlas is not such a large scale and not as accurate. Also the figures are scaled (quite accurately) from scanned paper maps, so very high accuracy is not expected. Nevertheless most of the circumferences are within 1% of the expected value for the globe (The "Times Atlas" is a bit out at high southern latitudes - not unexpected for a flat map).

These measurements can be repeated anywhere on earth you like. In many cases, if you have a straight E-W stretch of road you can verify the results yourself. No great accuracy is needed, as the differences between a globe and the flat earth are massive!

But, unless you seriously doubt maps that have been in use for many years, the circumference of the earth gets less as we move North or South from the equator.
To me (as William Carpenter might have said): "this is an incontrovertible proof that the Earth is a globe."

[1] Any navigator would think it ridiculous to suggest otherwise.

[rabinoz]

Am I to assume that everybody agrees that the earth cannot be flat?
I guess that must be so, since there are no objections.

Even on "the other site" someone claimed it was all lies and a Masonic plot! How do you like this for rational evidence?

Captain cook clocked the southern circumference at 67,000 miles which is consistent with a flat plane. Also, geodetic surveying has been refuted as a credible source of info. No doubt they used telescopes for centuries and would have quickly seen that there is no curvature with the equation given at 8 inches × distance squared. They would have also quickly noticed that boats don't disappear behind curvature when sailing off into the horizon. Geodetic surveying is also a Masonic created. They lied about the poles and curvature. No curve means no ball.

  Such wonderful reasoned evidence  , now maybe you can do better!

[jroa]

Am I to assume that you assume all of your data is Fact? 

[geckothegeek]

Am I to assume that everybody agrees that the earth cannot be flat?
I guess that must be so, since there are no objections.

Even on "the other site" someone claimed it was all lies and a Masonic plot! How do you like this for rational evidence?

Captain cook clocked the southern circumference at 67,000 miles which is consistent with a flat plane. Also, geodetic surveying has been refuted as a credible source of info. No doubt they used telescopes for centuries and would have quickly seen that there is no curvature with the equation given at 8 inches × distance squared. They would have also quickly noticed that boats don't disappear behind curvature when sailing off into the horizon. Geodetic surveying is also a Masonic created. They lied about the poles and curvature. No curve means no ball.

  Such wonderful reasoned evidence  , now maybe you can do better!

I suppose geodetic surveying has been refuted as far as the size and shape of Australia is concerned ?

[TotesNotReptilian]

Am I to assume that you assume all of your data is Fact?

Am I to assume that you assume that the data is False?

He sourced the data. Three separate sources. Do you have reason to believe those sources are wrong? Any evidence at all? Or are you just assuming it is wrong because it would be inconvenient for your theory if it was correct?

[rabinoz]

Am I to assume that everybody agrees that the earth cannot be flat?
I guess that must be so, since there are no objections.

Even on "the other site" someone claimed it was all lies and a Masonic plot! How do you like this for rational evidence?

Captain cook clocked the southern circumference at 67,000 miles which is consistent with a flat plane. Also, geodetic surveying has been refuted as a credible source of info. No doubt they used telescopes for centuries and would have quickly seen that there is no curvature with the equation given at 8 inches × distance squared. They would have also quickly noticed that boats don't disappear behind curvature when sailing off into the horizon. Geodetic surveying is also a Masonic created. They lied about the poles and curvature. No curve means no ball.

  Such wonderful reasoned evidence  , now maybe you can do better!

I suppose geodetic surveying has been refuted as far as the size and shape of Australia is concerned ?

Since I live here and have driven to most extremities and quite a bit through the middle, I am quite confident that those surveyors were spot on.

I wonder whether these Flat Earthers KNOW the sizes of their own countries and would publish it here so we could check them agaimst their "wonderful" map! Wot map?

It is comical though. I have had (on this site) Flat Earthers claiming that soon all the world will know the Earth is Flat - when they don't know the shape of their own Flat Earth!