# Flat Earth theory simple debunking by the moon's appearance

Discussion in 'Flat Earth' started by mineben256, Mar 2, 2016.

1. ### Roger MexicoNew Member

Is this why on our spherical earth we do not see an inversion on an E/W axis? I still haven't fully formed this idea in my mind where I can satisfactorily explain it to a flat earther.

"an inversion on an E/W axis? " I'm not really sure what you mean.

3. ### Roger MexicoNew Member

When you compare the view of the moon in the Northern and Southern Hemispheres, it appears inverted top to bottom. On flat earth this inversion should be right to left and vice versa if you had two people looking at it on an east/west axis, say one person in NYC and one person in Japan. Instead you see different parts of the moon, not an inversion like you do in the Northern and Southern Hemispheres.

The moon is never visually inverted. An inverted image would be mirrored (flipped). It's just visually rotated.

5. ### Roger MexicoNew Member

Sorry, I'm not being very clear. If you were on a flat earth wouldn't this visual rotation happen on an E/W axis as it does on a N/S axis? Actually I think I just realized what I wasn't understanding. On a N/S axis the image of the moon visually rotates so that the moon appears "upside down"", and on an E/W axis the image visually rotates left/right or right/left depending on where you are.

On a flat earth you'd be seeing either different parts of a sphere, of a squashed disk.

Place a sphere (like a football, or ideally a globe) in the middle of a room. Walk around it and look at it from different directions. It's like that, but the other way up. (on a flat earth).

On the actual (globe) Earth the moon is far away, so looks similar (in terms of what you can see) for everywhere on the global. The only majorly noticeable difference is rotation,

7. ### Roger MexicoNew Member

Thank you, this helps.

8. ### edbyMember

On a similar subject, I found a Flat earth forum discussion about why the moon’s surface looks pretty much the same at different locations (phases and orientation excepted). https://forum.tfes.org/index.php?topic=6673.msg121826#msg121826

He is right in one way. Diurnal libration is a form of parallax effect whereby we see a little more of one side of the moon (and a little less of the other) owing to to rotation of the earth in RET (or the movement of the moon in FET), between moon rise and moon set.

One explanation of why diurnal libration is so small (about 1 degree) is that the moon is about 385,000km away, and when an object is that far away, parallax effects are small. However, FET has to explain how this can be when the moon is only about 5,000km away.

The explanation given in the thread is that perspective works differently at long distances.

This is close to what philosophy of science calls ad hockery. Any exception to the theory is explained away by some arbitrary assumption or phenomenon. Remember that’s how Ptolemy’s system survived for a 1,000 years (epicycles).

However it’s hard to see how perspective explains this. Perspective is just angular distance. Assuming light travels in nearly straight lines, why would that rule change over long distances?

Last edited: Jun 19, 2018
9. ### Majd SaedyNew Member

Ironically, it's you who haven't given this much thought! you forgot that on a flat earth:

1- a flat moon (a disk) will look oval unless it is directly overhead.
2- a spherical moon will show a different side depending on viewer location, not the same side rotated.
3- a spherical moon will show a different phase depending on viewer location.

None of that has ever been observed...the moon alone is a killer to the whole FE model, time to discard it.

Last edited: Jun 21, 2018
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