@ SKEP,
Flat earth believers will call it bs,
because it is bs!
1.If the earth be the globe of popular belief, it is very evident that in cutting a canal, an allowance must be made for the curvature of the globe, which allowance would correspond to the square of the distance multiplied by eight inches, nearly. From the Age, of 5th August 1893, I extract the following:
" The German Emperor performed the ceremony of opening the Gates of the Baltic and North Sea Canal, in the spring of 1891. The canal starts at Hollenau, on the south side of Kiel Hay, and Joins the Elbe 15 miles above its mouth, It is 61 miles long, 200 feet wide at the surface and 85 feet at bottom, the depth being 28 feet. No locks are required, as the surface of the two seas is level."
Let those who believe it is the practice for surveyors to make allowance for "curvature" ponder over the following from the Manchester Ship Canal Company, — (Earth Review, October, 1893), " It is customary in Railway and Canal constructions for all levels to be referred to a datum which is nominally horizontal, and is so shown on all sections. It is not the practice in laying out Public Works to make allowance for the curvature of the earth." — Manchester Ship Canal Co., Engineer's Office, 19th February, 1892!
A surveyor, Mr. T. Westwood, writes to the Earth Review for January, 1896, as follows :
" In levelling, I work from Ordnance marks, or canal levels, to get the height above sea level I work sometimes from what is known as the Wolverhampton level, this is said to be 473.19 feet above sea level ; sometimes I work from the Birmingham level, this is said to be 453.04 feet above sea level. Sometimes I work from the Walsall level, this is said to be 407.89 feet above sea level. The puzzle to me used to be, that, though each extends several miles, each level was and is treated throughout its whole length as the same level from end to end ; not the least allowance being made for curvature, although if the earth were a globe, 112 feet ought to be allowed... One of the civil engineers in this district, after some amount of argument on each side as to the reason why no allowance for curvature was made, said he did not believe anybody would know the shape of the earth in this life."
I think most will grant that a practical man is capable of forming a judgment, in all cases of more value than the merely theoretical calculator. Here, then, we have the evidence of practical men to the effect that no allowance for curvature is made in cutting canals, a clear proof that we are not living on a huge ball, but on a surface, the general contour of which is level, as the datum line from which surveys are made
IS ALWAYS A HORIZONTAL LINE.
2.QUESTION : At approximately what altitude we can see that earth is spherical?
A FEW DIFFERENT ANSWERS :
1. Ground level if you look in the right places. The classic example is the way distant ships appear to sink as they cross the horizon. No need for any maths.
2. If you actually want to see the curvature of the Earth it depends what threshold to want to apply as 'noticeable'. Decide on how much curvature is noticeable and determine the how much horizon needs to be in view to see that much curvature. One equation for the horizon distance is S = 1.42sqrt(H) where S is the distance in miles and H is the height in feet. From there you can get your answer with a bit of simple geometry.
3. Presuming that you mean with the naked eye, you only need to be a few kilometres in the air for it to be obvious. If you have ever been in an aeroplane on a clear day, the curvature of the Earth is easily visible. It can even be detected at sea in calm weather.
4. You would never see that at any altitude. The earth is flat.
5. You could see the curvature of the earth every day while travelling on Concorde....
6. Perhaps it is a fantasy. I swear that on the two times I flew the Condorde I could see the curvature. In any event, the experiences are sealed in my brain. What great memories!!
7. The curvature of the Earth was visible on my Concorde flight, along with the darnkess of the sky. It wasn't black but very dark blue. I have not been able to see either features on a normal flight up to 40k
8. My father used to travel on Concorde. When asked about seeing the curvature of the Earth, he thought it was pretty imperceptable, albeit beginning to become noticable, and probably due more to the power of suggestion or camera distortion than anything else. He thought, apparently, you have to go up in the likes of U2 aircraft (70,000 feet) before one really has a spectacular view of the Earth's curvature, although of course the view from Concorde certainly was unique and spectacular. I only flew it once when a child.
9. From a friend who was a military pilot, and from sources such as the many books I have read on the SR-71 and U-2 it can be said that this doesn't appear until you get up to 55K-60K feet........The highest I have been is 41K on a 777 and I couldn't see anything but a flat horizon.
10. I am an airline pilot, and the highest I have been is 41000'. Can't say that I have noticed any curvature. Not that I have been specifically looking for it either though.
I would also guess that one would have to be at least 20 miles up to notice a curve without any instruments.The first direct visual detection of the curvature of the horizon has been widely attributed to
Auguste Piccard and
Paul Kipfer on 27 May 1931. They reported seeing it from a hydrogen-filled balloon at an elevation of 15 787m (51 783 ft) over Germany and Austria. On 11 November 1935,
Albert W.Stevens and
Orville A. Anderson became the first people to photograph the curvature. They were flying in the helium-filled Explorer II balloon during a record-breaking flight to an altitude of 22 066m (72; 395 ft) over South Dakota. Other claims have been made as to being the first to see the curvature of the Earth, but they seem to have come long after visual curvature had been established.
Interviews with pilots and high-elevation travelers revealed that few if any could detect curvature below about 50; 000 ft. High-altitude physicist and experienced sky observer
David Gutierrez reported that as his B-57 ascends, the curvature of the horizon does not become readily sensible until about 50 000 ft and that
at 60 000 ft the curvature is obvious. Having talked to many other high fliers (SR-71, U2, etc.), Gutierrez confirms that his sense of the curvature is the same as theirs. Passengers on the Concorde (60; 000 ft) routinely marveled at the curvature of the Earth. Gutierrez believes that if the field of view (FOV) is wide enough, it might be possible to detect curvature from lower altitudes.
The author has also talked to many commercial pilots, and they report that from elevations around 35; 000 ft, they cannot see the curvature.
http://www.howitworksdaily.com/how-high-do-you-have-to-go-to-see-the-curvature-of-the-earth/
Just some background in physics. The sun is bright and screws up our pics on earth. Going outside the earth the suns brightness is much greater and reflected more off the atmosphere of the earth. Any picture would be unreadable due to the sun producing a massive lens flare.
Just one snapshot from my video:
So, 110 000 ft is almost twice as high as 60 000 ft, and we still can't see any curvature of the Earth?How come?
Well, this question we need to ask a true scientist, and
AusGeoff is a true scientist without a slightest doubt:
Cikljamas presents:
Flat Earth All Around You : " class="bbc_link" target="_blank" rel="noopener noreferrer"> (don't forget to switch full screen)
There are people who will never admit the trueness of this fact. If they continue to refuse to recognize what their eyes see, then let them keep their noses in their asses for ever...
Is these sorts of of low resolution YouTube videos really the best "evidence" you can produce to support your claim of a flat earth? Seriously? Can you be 100% certain that this one's not been digitally manipulated? And why have they been captured with a potato instead of a digital camera?
And you're apparently happy to ignore the thousands of the European Space Agency videos, and the Australian Centre for Space Engineering Research videos in favour of this dross? Not good enough.
Aren't you satisfied with an answer (above) of a true scientist?
