This is consistent with the mainstream view of cosmology but it contradicts Flat-Earth theory.
If the Flat-Earth model of Fig. I.6 was correct, with the Earth a flat disc and the stars circling about the North celestial Pole once a day, then everyone on Earth should be able to see all of the stars. In particular, everyone on Earth should be able to see Polaris, the North Star. In fact, people who live more than about 1 degree south of the Equator cannot see Polaris. Furthermore, if you live north of about 25 degrees latitude in the Northern Hemisphere, you cannot see the Southern Cross constellation. This is exactly what one would predict with a spherical Earth, but Flat-Earthers must invent far-fetched and arbitrary excuses why this is so.
Also, in the Southern Hemisphere the stars appear to rotate about the South celestial pole. Unlike the Northern Hemisphere, with the bright star Polaris very near the North celestial pole, there is not a bright star located at the South celestial pole. The South celestial pole is close to the faint star Polaris Australis. People who have traveled to the South Pole indeed see the stars apparently rotating about the South celestial pole (note that Flat-Earthers on a 2020 cruise to the Antarctic will see the stars rotating around the South celestial pole — they will also not see Polaris). This motion is impossible in the Flat-Earth model.
II.4: Lunar Eclipses
Fig. II.10 shows the Flat-Earth conception of the Sun and the Moon. These two bodies are supposed to be the same size, each 3,000 miles above the flat Earth, and they rotate over the flat Earth on opposite sides of circles of changing size. Furthermore, the Sun does not radiate light in all directions, but shines like a searchlight (this is so some areas of Earth can experience sunlight while other areas are in darkness). Flat-Earthers have a difficult time explaining why the Sun rises over the horizon in the morning and sinks below the horizon at night (natural to explain for a spheroidal, rotating Earth).
Flat-Earth theory has a hard time explaining eclipses in general, but a lunar eclipse is especially difficult for them. A lunar cclipse occurs when the spherical Earth moves directly between the Sun and the Moon. The Earth blocks all or part of the Sun’s rays from reaching the Moon. A total lunar eclipse occurs with the configuration shown in Fig. II.11. There will be a darker shadow called the umbra, and a less dark region called the penumbra. A total lunar eclipse occurs when the configuration is such that the Moon lies entirely within the umbra. When this occurs, the only light that reaches the Moon is sunlight that is refracted by the Earth’s atmosphere. The green through violet part of visible sunlight gets filtered out in this process, and does not appear on the Moon. Red light is refracted least, and so the Moon appears as blood red during a total lunar eclipse.
As the Sun, Earth and Moon move, the Earth’s shadow can be seen moving across the Moon. Since the Earth is a globe, its shadow is an arc of a circle. During some lunar eclipses we can see the shadow of the Earth move across the Moon – yet another proof that the Earth is a globe, and that it moves. Fig. II.12 shows images from a total lunar eclipse in 2019.
A lunar eclipse presents major difficulties for Flat-Earthers. Since the Earth is supposed to be a flat stationary disc, there is no way that the Earth can be interposed between the Sun and Moon. Hence Flat-Earthers must invent something to explain why one sees a shadow of a spherical object obscuring the Moon.
For many Flat-Earthers, this mysterious body is an “Antimoon.” This is supposedly a body whose orbit is extremely close to the Sun. It cannot be seen because the Sun is so bright that it ‘hides’ the Antimoon from view. Of course, this is all nonsense. The only purpose for the Antimoon is to provide a lame excuse why the Earth’s shadow appears to cross the Moon.
However, the Flat Earth Society acknowledges that the body obscuring the Moon could be some other object, which they call the Shadow Object rather 