Is the Earth flat or round???

The Barbarian

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The observed motion of the stars can only be explained by realising the earth is a sphere. This has been known for 2500 years.

As you seem to be mentioning, Eratosthenes of Alexandria accurately computed its diameter about that time. But the Greeks and other seafaring peoples realized it was a globe long before that.

All the more so when you travel to Australia.

The rotation of the southern sky was one argument that I missed.
 
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JacksBratt

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Watch those Australian stars rotate around something that is not Polaris:

We talked about this before, Rad..... The stars can only move one direction... in either model... but even more assuredly, on a globe...

Every point on the globe is moving the same direction..the stars... buy this simple fact, cannot "change direction" in the south...

The thing is... if you face north... the celestial bodies will move from left to right... If you face south.. the opposite is true.... There are no magical direction changing stars.. It's impossible... especially on a globe.
 
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JacksBratt

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And your explanation for stellar parallax is...
Easily explained by Perspective and atmospheric lensing.


Why can we see objects from extended distances when they should be well beyond the curve of the earth and hidden by the globe as it drops away?
 
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JacksBratt

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Not goading. Just cant understand where you get those beliefs for in your posts?
Why not ask then? Just because you are ignorant of information that is out there... is no need to condescend. It portrays a character that is insecure in it's ignorance thus it lashes out with verbal attacks at those it cannot compete with on an intellectual level.
 
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JacksBratt

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Then you misinterpret scripture and how people saw the world all those years ago.

God gave us science. He gave man the ability to learn. If we didnt learn we would still be stuck with a stone wheel!
Science is man's interpretation of the observations it makes... Men of science are those of "man's wisdom".

These men, who contradict the word of God will be those who are fulfilling this scripture:

Romans 1:21-23 King James Version (KJV)

21 Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.


22 Professing themselves to be wise, they became fools,


23 And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things.

 
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The Barbarian

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We talked about this before, Rad..... The stars can only move one direction... in either model... but even more assuredly, on a globe...

But antipodes see it it from an "upside down" orientation. So, in the Northern Hemisphere we see it the apparent motion of the stars as counterclockwise. In the Southern Hemisphere, we see it as clockwise. There's no way to explain this on a flat Earth, unless you suppose that some of us are on one side of the disc and some of us are on the other. But then, it's essentially like the round Earth.

Every point on the globe is moving the same direction..the stars... buy this simple fact, cannot "change direction" in the south...

And yet, we see them going in the opposite direction in the southern hemisphere. This can only be explained by a global Earth.

The thing is... if you face north... the celestial bodies will move from left to right... If you face south.. the opposite is true.... There are no magical direction changing stars.. It's impossible... especially on a globe.

It's only possible on a globe. (Or a disk with people living on both sides of the disc. But then, the differences in the visibilities of various stars at different times can't be explained by a disk.
 
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The Barbarian

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Radagast said:
And your explanation for stellar parallax is...

Easily explained by Perspective and atmospheric lensing.

Sounds intriguing, show us for Alpha Centauri 1. BTW, "perspective" in such cases is called "parallax." Perspective is how we know how far away it is. And given that we have more accurate readings from orbiting telescopes like the Hubble, atmospheric lensing isn't a concern.
HubbleSite: Image - Stellar Parallax

But let's see what you've got. Checkable data and math will be necessary. You're on.
 
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JacksBratt

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Let's go on...



Because they are constantly corrected by the pilot or autopilot. But ballistic objects are affected. The V-2 missiles were "aimed" with consideration of the Earth's rotation. I should mention that it works on smaller systems with higher rotational speeds. There was, near my community, an amusement park with a circular rotating room. People would go in and line up around the wall, after which the room would begin to rotated. Eventually, the floor would drop down, and you'd be held against the wall. Which seemed like a great opportunity to me. My son and I went in, and tossed ping pong balls, which (in the rotating frame of reference of the room) did indeed fly in curved paths.

As we left the ride, security asked us to leave the park, which we did.

Barbarian observes:
So far, no one has been able to offer an explanation for the fact that one can launch larger payloads into space when launching eastward close to the equator, other than the Earth's rotation.



And the European Space Agency, and Russia's Roscosmos, and the Indian Space Research Organization , and the China National Space Administration and the Japan Aerospace Exploration Agency, among others. There are 14 space agencies capable of launching satellites at this time. I know, it's the Great American, Russian, Chinese, European, Japanese conspiracy to fake space craft launches, right?

Barbarian observes:
So far, no one has been able to offer an explanation as to why a large earthquake very slightly changed the apparent movement of the stars immediately after, other than the Earth's rotation.



Sorry, you're wrong. Immediately after the earthquake, there was a measurable change in the apparent motion of stars, precisely the amount of change that would be attributable to the quake. No point in denial. And inertia is a very measurable concept.



If not, it's hard to explain how the Lunar Ranging Mirror Array got set up there. And we know it's there, because every observatory on Earth can bounce lasers off it and get extremely precise measurements of lunar distance. So now all the astronomers on Earth are in on the great conspiracy, um?



Even 300 years ago, sailors knew that's wrong:

Prevailing winds are winds that blow consistently in a given direction over a particular region on Earth.[1] Due to factors such as uneven heating from the Sun and the Earth's rotation, these winds vary at different latitudes on Earth.

550px-Prevailingwinds.png

Sailors chose their latitudes according to the direction they wanted to go, and they avoided if they could, the dreaded Doldrums.
Doldrums | meteorology


continued:
If the Coriolis effect was in fact a force... then every direction of the compass rose would require a different calculation... from none what soever at straight east or west.. through a varying amount of correction as you move throughout the degrees in realation to the west to east spin of the globe.

I have watched, and posted previously, the lengthy comentary of a military marksman describing the variables in taking long range shots..

They include:
Length of barrel
Barrel thickness
Rate of turn of rifling
number of shots in a given time (barrel temp)
Ammunition temperature
Elevation
Inclination angle
Humidity
Wind
Atmospheric pressure changes
Ambient temperature

Not one mention of Coriolis..... not one.
 
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The Barbarian

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f the Coriolis effect was in fact a force...

Coriolis Effect. Like "centrifugal force", the "Coriolis force" is a myth. It merely appears to be a force in the context of a rotating system.

centrifugal_force.png


then every direction of the compass rose would require a different calculation...

Turns out, it does, if the there's time and distance to make it necessary, such as the German V-2, or ICBMs.

I have watched, and posted previously, the lengthy comentary of a military marksman describing the variables in taking long range shots..

Not one mention of Coriolis..... not one.

Well, let's take a look...

Before, I mentioned that the vertical element associated with the Coriolis effect is actually called the Eötvös effect. To give you an idea how the Eötvös effect alters a trajectory, here’s an example. Let’s say you’re firing a .308 175gr bullet, with a muzzle velocity of 2700fps, from a latitude of 45°. The drop at 1000yds will be 392 inches, shooting either to the north or south (without error). Shooting with an azimuth of 90°, or eastward, the drop will be 388in. Shooting with an azimuth of 270°, or westward, the drop will be 396in. In either case, there is a total change in drop of 4in. An easy assumption is to predict that, when shooting with an intermediate azimuth, that the drop change will be linear. This is incorrect. Instead of a 2in change for an azimuth of 45°, the error is a function of the sine of the azimuth angle. For those of you who don’t have a fondness for trigonometry, this essentially means that you have half the error at 30° rather than at 45°. Changes in latitude have a minimal effect, since at the equator, where the effect is greatest, the error would be 5in, only one inch more than the error we calculated at 45° latitude.

What is most affected by Coriolis Effect is the horizontal component of the bullet trajectory. Because of the Coriolis effect, every moving object not connected to the ground is always deflected to right in the Northern Hemisphere, and always toward left in the Southern Hemisphere. The deflection is not east or west, but specifically to the right or left with reference to the shooting direction. It doesn’t matter in which direction you shoot; it is a function of latitude and average bullet speed. Its effect is maximum at the poles, and decreases as one moves toward the Equator, where it is minimal. The explanation of this phenomenon is more difficult than the explanation of Eötvös Effect, so I won’t go into it into detail.

Here’s an expample of error due to Coriolis effect: firing the same .308 175gr bullet at 2700fps muzzle velocity, from a latitude of 45° in the Northern Hemisphere, the deflection at 1000yds will be of 3in to right. At the North Pole, where the effect is maximum, the deflection will be a little more than four inches. The deflection will be the same in the Southern Hemisphere, but it will be to the left, instead.

https://loadoutroom.com/thearmsguide/external-ballistics-the-coriolis-effect-6-theory-section/

You missed it.
 
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The Barbarian

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JacksBratt said:
Easily explained by Perspective and atmospheric lensing.

Barbarian suggests:
Sounds intriguing, show us for Alpha Centauri 1. BTW, "perspective" in such cases is called "parallax." Perspective is how we know how far away it is. And given that we have more accurate readings from orbiting telescopes like the Hubble, atmospheric lensing isn't a concern.
HubbleSite: Image - Stellar Parallax

But let's see what you've got. Checkable data and math will be necessary. You're on.

(still waiting...)
 
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Lost4words

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Why not ask then? Just because you are ignorant of information that is out there... is no need to condescend. It portrays a character that is insecure in it's ignorance thus it lashes out with verbal attacks at those it cannot compete with on an intellectual level.

Ignorant of scientific proofs? Lol. Really?

Every time you are shown scientific proofs you dismiss them!

I bet God is looking down at flat earth believers, 6k believers and shouting out:

"You got your Bibles upside down!"
 
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Lost4words

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Science is man's interpretation of the observations it makes... Men of science are those of "man's wisdom".

These men, who contradict the word of God will be those who are fulfilling this scripture:

Romans 1:21-23 King James Version (KJV)

21 Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.


22 Professing themselves to be wise, they became fools,


23 And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things.


Oh dear oh dear :doh:
 
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