How do you know the Earth isn't flat?

Awwww, shucks…:blush:

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Stratellites:

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IMO you’ve just qualified for a good parenting award.

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"How do you know the Earth isn’t flat?"
I tried to balance it on a wobbly table once, and it rolled off.

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Sadly, the Flat Earthers have answers for these. Any satellite images are faked, and the ocean/ship thing is just a perceptual thing.

… I didn’t say they were good answers.

Poor A’Tuin.

Also, I’ll one up all of y’all.

Some of these people are convinced the moon is fake.

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It amazes me that so many allegedly “educated” people have fallen so quickly and so hard for a fraudulent fabrication of such laughable proportions. The very idea that a gigantic ball of rock happens to orbit our planet, showing itself in neat, four-week cycles – with the same side facing us all the time – is ludicrous. Furthermore, it is an insult to common sense and a damnable affront to intellectual honesty and integrity. That people actually believe it is evidence that the liberals have wrested the last vestiges of control of our public school system from decent, God-fearing Americans (as if any further evidence was needed! Daddy’s Roommate? God Almighty!)

Documentaries such as Enemy of the State have accurately portrayed the elaborate, byzantine network of surveillance satellites that the liberals have sent into space to spy on law-abiding Americans. Equipped with technology developed by Handgun Control, Inc., these satellites have the ability to detect firearms from hundreds of kilometers up. That’s right, neighbors … the next time you’re out in the backyard exercising your Second Amendment rights, the liberals will see it! These satellites are sensitive enough to tell the difference between a Colt .45 and a .38 Special! And when they detect you with a firearm, their computers cross-reference the address to figure out your name, and then an enormous database housed at Berkeley is updated with information about you.

Of course, this all works fine during the day, but what about at night? Even the liberals can’t control the rotation of the Earth to prevent nightfall from setting in (only Joshua was able to ask for that particular favor!) That’s where the “moon” comes in. Powered by nuclear reactors, the “moon” is nothing more than an enormous balloon, emitting trillions of candlepower of gun-revealing light. Piloted by key members of the liberal community, the “moon” is strategically moved across the country, pointing out those who dare to make use of their God-given rights at night!

Yes, I know this probably sounds paranoid and preposterous, but consider this. Despite what the revisionist historians tell you, there is no mention of the “moon” anywhere in literature or historical documents – anywhere – before 1950. That is when it was initially launched. When President Josef Kennedy, at the State of the Union address, proclaimed “We choose to go to the moon”, he may as well have said “We choose to go to the weather balloon.” The subsequent faking of a “moon” landing on national TV was the first step in a long history of the erosion of our constitutional rights by leftists in this country. No longer can we hide from our government when the sun goes down.

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It’s not fake, it’s totally a giant cheese wheel in the sky! :wink:

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This reminds me of Wittgenstein:

“Tell me," Wittgenstein’s asked a friend, “why do people always say, it was natural for man to assume that the sun went round the earth rather than that the earth was rotating?” His friend replied, “Well, obviously because it just looks as though the Sun is going round the Earth.” Wittgenstein replied, "Well, what would it have looked like if it had looked as though the Earth was rotating?”

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That’s no moon…

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“Oh, wait. Yes, it is a moon. As you were.”

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Correct. It is a moon:

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If anything outside of geometry can be called a sphere then I think the earth can. I know it is very slightly wider at across the equator than the poles but the difference is undetectable to the eye. Earth is round. Certainly rounder than a football and technically rounder than a billiard ball and I haven’t heard them described as oblate spheroids.

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A football is not a football. It is a hand egg.

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I should have said basket ball. Forgot Yanks and Ozzies don’t know what a football looks like.

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Yes we do! A football is a prolate spheroid.

And a soccer ball is a truncated icosahedron that ate too much pudding.

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I guess it depends on the level of precision required in your measurement. If you are navigating ships across oceans and passing through narrow straits, a pretty high level of precision is needed.

I thought navigation was traditionally done using flat maps that as far as I know cannot accurately map either a sphere or the very nearly a sphere.

Only on long distance navigation could I imagine it making any difference and then only fractionally. Maybe the America’s cup yacht race teans account for the earth being non spherical but I doubt it. The earth also bulges out towards the sun and moon but again only imperceptibly.

The earth is 100% a sphere because it is approximately 99.65% a perfect sphere. Picturing the earth as a squashed ball or lumpy potato shape is wrong. The earth is a fractal that changes with scale and time cannot be exactly represented by any geometric construct. The one that comes closest is a sphere.

Straight line navigation is done over short distances, like crossing the Gulf of Mexico. The longer one travels, the more error is going to be introduced. Also, there is increased waste of distance and time, which can be expensive. the shortest distance between two points on a sphere is drawn on a Mercator as a curve. Also in the efficiency equation is the safe distance at which one passes hazards to navigation, which can be underwater and invisible. If one assumes that the earth is a perfect sphere, small errors begin to be introduced, and become large errors during a long transit.
We currently use WGS84 standard, which is that the earth’s surface is an oblate spheroid (ellipsoid) with major (equatorial) radius a = 6378137 m at the equator and flattening f = 1/298.257223563.[6] The polar semi-minor axis b then equals a times (1 − f), or 6356752.3142 m.
it seems obsessive, but when you are navigating a ship costing hundreds of millions of dollars, on voyages of thousands of miles scheduled down to the minute and the meter, every advantage matters.

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