Unipolar vs Bipolar

The spherical earth model accurately predicts when 'apparent' sunrise and sunset will occur across the earth for given coordinates, as well as when high noon will occur. Therefore, any flat earth theory must produce the same predictions of 'apparent' sunrise and sunset. I see irreconcilable problems with both the unipolar and bipolar versions of flat earth theory.

Unipolar:
Because of the above, longitude in our flat earth map must match the longitudes given on a spherical map of the earth. Otherwise the spherical earth hoax wouldn't work. However, this would make it impossible for an equinox to occur if the sun illuminates a circular portion of the earth, as the day-night terminators would have to have the same angular separation at all latitudes.
There's also no explanation of why there are two celestial poles and why the southern constellations can be seen from the opposite sides of the rim of the circular earth but cannot be seen from the center.

Bipolar model:
Anyone near the crossing point of the figure 8 will observe sunrises twice as often as those near the ends of the figure 8.


Apologies to the mods, I think logging in redirected me to the General forum which is why I originally posted this there.

Further, neither model can account for the unsetting sun in antarctic summers. The bipolar model also can't account for it in the arctic.

4 weeks till the equinox. They will maybe go silent or else the drivel will run like a river.

I present this argument in this form in an effort to keep mathiness to a minimum for the reader.

In addition to conserving longitude in a unipolar map, the accurate prediction of sunrise and sunset times by round earth theory means that latitude must also be conserved in some way. That is, things north and south of a given point on the globe must be further poleward and rimward, respectively, on the unipolar map. This is necessary in order to have a smooth continuous function predicting day length as a function of latitude.

Thus, at least for inhabited parts of the earth where people would notice if sunrise/sunset predictions were wrong, an accurate unipolar map must be an azimuthal projection of the accepted spherical earth map with longitude preserved exactly and latitude translated to distance from the pole as a countinuously decreasing function of the latitude given in the accepted spherical map.

This constraint clearly requires that any two points at the same given latitude with a given longitudinal separation be closer together than two points with the same longitudinal separation at a more southerly latitude. This is completely at odds with known distances, airline flight times, overwater shipping times and automotive travel times in the southern hemisphere.

There wiki is mistaken. They are talking about unipolar and bipolar bears, not maps.

It is not just a "path of the sun" problem with the bipolar map. There are times of day when both eastern Asia and the United States are in daylight, and Europe and Africa are in their nighttime. How do I know? I speak with clients all over the world and so am very familiar with time zones and when I can and cannot reach a client from here in the US. For example, right now in March, when it is 3:00 pm in NYC, then it is 4:00 pm in Buenos Aires, 6:00 am in Sydney, 7:00 am on the Kamachatka peninsula in Eastern Siberia, 8:00 am in Auckland, 9:00 pm in Madrid and Cape Town, 10:00 pm in Moscow, 3:00 am in Beijing, and 12:30 am in New Delhi.

In order for that to work on the bipolar map, the darkness of the night would be located in the middle of the map slicing diagonally across Africa and Europe and much of Asia (but not all of Asia), while the left and right sides including North and South America, Hawaii, Australia, New Zealand, and far eastern Russia would be in daylight. Japan and China would be in darkness while Australia and Eastern Siberia would be in daylight. That would be quite a trick with just one Sun. Really, how do Australia and Eastern Siberia manage to be in daylight when China and Japan are between them on the map and yet would be in darkness?

Maybe there are two suns...and the reason we can't ever see both at the same time....is.....because.....?

Actually, the more I look at the map, I see that the area of daylight forms a very large circle that encloses the area of darkness on the map....how the heck would that work?

At least the unipolar map does not have this problem of a circle of sunlight enclosing an area of darkness.

PS: It is also daylight on Wake Island, but I am not sure where that appears on the bipolar map. It is located south and east of Japan. But if it is on the right side of the bipolar map, then it clearly completes the circle of daylight surrounding the areas of darkness on the bipolar map.

PPS: Here is a thread with the bipolar flat earth map: https://www.theflatearthsociety.org/forum/index.php?topic=59778.90

No single plane FE model will ever work.
We know there is a north celestial pole, which all stars in the north appear to rotate around and a south celestial pole, which all stars in the south appear to rotate around.
We know that no matter where you are, these are always 180 degrees apart.

No flat shape can have that, where you have 1 point at the origin and then 1 single point which is simultaneously in every direction around the origin. (if you wish to claim one of the points isn't the origin, you can simply translate it so it is)

But it works fine on a sphere.

But it works fine on a sphere.

Exactly!!