so - I don't understand pictures of people parachuting . . .
« on: November 10, 2017, 02:20:39 AM »
Hi all - I am new.  Just wondering about pictures of people parachuting - where you see the earth's curvature behind them.  (I hope I did the attachment right.) These people are 12-13k feet above the earth.  They are obviously not in a plane, so there is no curvature caused by airplane windows.  On the internet, there are a lot of pictures of other people parachuting (which I unfortunately can't afford to do), so they all can't be using the same camera with the same distortions.  And most of these people are not astronauts or work for NASA, etc. - they are unrelated people without an agenda other than having fun.  FE advocates accept some empirical data as proof - but they don't like photos, though they accept Lady Blount's sheet photo(s).  So what is the cause of this seemingly optical illusion of an earth curvature in many parachuting pictures?

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Offline junker

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Re: so - I don't understand pictures of people parachuting . . .
« Reply #1 on: November 10, 2017, 02:25:25 AM »
Barrel distortion and/or fisheye lenses. Even round earth proponents will tell you that.
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Re: so - I don't understand pictures of people parachuting . . .
« Reply #2 on: November 10, 2017, 02:41:18 AM »
If the horizon is below the center of the image it will curve the other way. This is the optics of a wide angle lens.

Re: so - I don't understand pictures of people parachuting . . .
« Reply #3 on: November 10, 2017, 02:41:33 AM »
Sorry, meant to link to this page that has such pictures: http://www.skydivenewengland.com/first-time-skydiving/

Re: so - I don't understand pictures of people parachuting . . .
« Reply #4 on: November 10, 2017, 02:54:46 AM »
it's interesting my original answer was deleted by telling me I had to sign in again

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Re: so - I don't understand pictures of people parachuting . . .
« Reply #5 on: November 10, 2017, 02:58:09 AM »
it's interesting my original answer was deleted by telling me I had to sign in again

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Offline TomInAustin

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Re: so - I don't understand pictures of people parachuting . . .
« Reply #6 on: November 13, 2017, 08:00:46 PM »
Barrel distortion and/or fisheye lenses. Even round earth proponents will tell you that.

As a reformed skydiver who did many video jumps yes, a wide angle lens is quite common.
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Re: so - I don't understand pictures of people parachuting . . .
« Reply #7 on: November 13, 2017, 09:47:54 PM »
Hi all - I am new.  Just wondering about pictures of people parachuting - where you see the earth's curvature behind them.  (I hope I did the attachment right.) These people are 12-13k feet above the earth.  They are obviously not in a plane, so there is no curvature caused by airplane windows.

The curvature of the horizon in the Round Earth is not easily measurable until altitudes far above most airplanes.   You can only see it clearly in photographs up at around 100,000 feet.

Hence, the photos you are seeing must have been taken through a lens with some "fish-eye" or "barrel" distortion...which makes them useless for discussions about the shape of the earth.

In the examples I've found - taken from amateur "weather balloon" flights - you need to find a video that starts when the balloon is launched and has no editing breaks up to 100,000 feet or more.   Then you can usually find things like buildings that you know to be straight in the real world - and demonstrate that they are (or are not) straight in the photograph.  If they are - then the lens isn't distorting the shape of things it photographs - so the high altitude horizon photos are a reliable source.

Check out my post here, for example:

https://forum.tfes.org/index.php?topic=6926.msg126381#msg126381

Hey Tom:  What path do the photons take from the physical location of the sun to my eye at sunset?

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Re: so - I don't understand pictures of people parachuting . . .
« Reply #8 on: November 13, 2017, 09:50:35 PM »
As a reformed skydiver

Was skydiving affecting your ability to function in society?

But seriously, skydiving looks awesome, I once saw an old clip where an army skydiver cut another mans legs off with his arm when they hit during free fall, the legless man survived and the armless man died. I've always wanted to do a tandem jump but yeah, people die occasionally, in fact, three skydivers died here last month.

http://www.abc.net.au/news/2017-10-13/mission-beach-sky-diving-deaths-three-people/9048480

Sorry for being a tad off topic, I think the lens thing is answered quite well.



 
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Offline Roger G

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Re: so - I don't understand pictures of people parachuting . . .
« Reply #9 on: November 14, 2017, 12:37:06 AM »
I've worn parachutes many times when competition gliding or doing aerobatics, but thankfully never had to use one. I see skydiving as committing suicide, then waiting for something mechanical to happen to save you :o

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Re: so - I don't understand pictures of people parachuting . . .
« Reply #10 on: November 14, 2017, 04:12:06 PM »
As a reformed skydiver

Was skydiving affecting your ability to function in society?

But seriously, skydiving looks awesome, I once saw an old clip where an army skydiver cut another mans legs off with his arm when they hit during free fall, the legless man survived and the armless man died. I've always wanted to do a tandem jump but yeah, people die occasionally, in fact, three skydivers died here last month.

http://www.abc.net.au/news/2017-10-13/mission-beach-sky-diving-deaths-three-people/9048480

Sorry for being a tad off topic, I think the lens thing is answered quite well.

It is awesome and yes it affects your ability to function in society.   I was in the sport for 7 years and basically checked out of life.  But as more and more friends died it seemed like a good idea to hang it up.
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Re: so - I don't understand pictures of people parachuting . . .
« Reply #11 on: November 14, 2017, 04:27:10 PM »
Hello friend. Remember That the earth is not completely flat like this ______ but rather is curved up a little bit and so you can this small discrepancy from these heights.

Re: so - I don't understand pictures of people parachuting . . .
« Reply #12 on: November 14, 2017, 09:05:23 PM »
Hello friend. Remember That the earth is not completely flat like this ______ but rather is curved up a little bit and so you can this small discrepancy from these heights.
Um... what? :o Where is the info on this "flat but convex" theory?
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Re: so - I don't understand pictures of people parachuting . . .
« Reply #13 on: November 14, 2017, 09:57:40 PM »
Hello friend. Remember That the earth is not completely flat like this ______ but rather is curved up a little bit and so you can this small discrepancy from these heights.
Um... what? :o Where is the info on this "flat but convex" theory?
Well, I suppose it's an interesting effort to piss off both sides of the debate!

Any curvature less than a full sphere isn't going to reproduce the effects we see at 100,000 feet - you'd have to be a LOT higher than that with a more subtle curve...yet on the other hand, you still wouldn't get sunsets or anything like that without all of the usual FET stuff.

The big problem with a subtly curved Flattish-Earth is gravity.

Real gravity doesn't work on a finite flattish-Earth because there would still be a net force towards the center.

Real gravity doesn't work on an infinite flattish-Earth because it would be like living on a hillside.

Universal Acceleration doesn't work because on the outer edges of the world, you'd keep falling over.

All of the water would run off the top of the world and end up in a large puddle around the perimeter.

Hey Tom:  What path do the photons take from the physical location of the sun to my eye at sunset?