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I'm trying to come up with ways to find one's bearings on a flat world. Here's a mock-up map I have used on the two previous discussions on the topic.

UN logo in green with a star in the center and a shadow on Europe and Africa

So, we have a flat plane with a sun relatively low above the center and a bunch of sky-island type shades providing the day-night cycle. If you let go of an object you're holding, it accelerates downward at 10 meters per second squared because Things Fall Down, and there's definitely magic involved somewhere, but I'd like to keep the mundane physics as close to the real world as possible. However, there isn't a magnetic field because there is no giant ball of hot iron spinning to create it.

During the day, the sun is of course a landmark you can orient yourself by, and you can find your latitude by the angle of the sun.

But, how would you go about finding your bearings during the night, or with an overcast sky, and how to determine one's longitude? Are there some weird tricks for navigation on a flat world that don't work on a spherical one?

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  • $\begingroup$ Sun and planet are stationary ? or does this planet orbit the sun, plane remaining perpendicular ? Clouds are a showstopper indeed, there is no compass. On a clear night, it will be easiest to navigate. You can use the stars, in all directions. During daylight, it will always be difficult. There is no navigation on sun position, as you propose. Why ? The sun-planet distance is much larger than the size of your flat planet. The sun will be exactly above for every observer on the flat planet, there will be a minor parallax shift, but you'd need high-tech precision instruments to detect it. $\endgroup$
    – Goodies
    Nov 27, 2021 at 12:12
  • $\begingroup$ Since the physics of your world is maintained by magic, why can't people have magical compasses? Or they could look for the beauteous Lubbardy bird, which always leads you where you need to go? The only real-world "tricks" we can tell you about would relate to real-world physics. Please tell us about the physics of your world... then we can give you pointers, else: magic. $\endgroup$ Nov 27, 2021 at 12:25
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    $\begingroup$ @Goodies The sun hangs low enough (or possibly is perched on a mountaintop) that the sky islands orbiting in cast shadow on the whole world. Presumably it gives off less hazardous radiation than an exposed fusion core would. $\endgroup$
    – HAEM
    Nov 27, 2021 at 12:59
  • $\begingroup$ Sounds to me like you need a literal mountain of lodestone for compass reasons $\endgroup$
    – Lemming
    Nov 27, 2021 at 13:01

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You don't have to see the "sun" to know where it is.

The way you describe this with a "sun" at a fixed point surrounded by shadow squares, you have the same situation as in Niven's Ringworld - any area in shadow is like a cave, because it is always in shadow. A tree will not have green grass growing behind it! Even on Earth people navigate by looking for the mossy side of a tree, but in this scenario that doesn't require nearly so much optimism to do.

Your latitude should be discernable from the shadows of large branches, etc. Your longitude is directly related to the times at which the Sun is visible, so a watch set in Greenwich will still find you the prime meridian.

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Still the sun, but indirectly.

The sun disappear at night, right? Where does it go? I assume that the sun and the moon, being spherical non-flat celestial bodies, run around the totally normal flat earth.

The moon's crescents indirectly tells where the sun is currently located. Since the sun is underneath the earth, earth's shadow will shape the visible moon into a crescent which "horns" points toward the sun's current position. Other celestial bodies, whether earth's satellites or even other planets / astronomical phenomenon will be visible in a different light according to where the sun is.

All there is left is a mean to calculate one's position according to how the night sky is illuminated. Also, as the moon and sun moves, the visible shape of the moon will be altered during the night, which is pretty rad.

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If it's any consolation, the Flat Earth model that people in the real world have used still includes electromagnetism;- the electromagnetism simply doesn't require the earth as a whole to be spinning in order to take place. In the model, the earth is viewed as a flat torus shape (like that of a CD) with the north pole being where the hole in the middle of the CD would be, with there being magnetized metal underneath the north pole's ice that still contributes to the creation of a worldwide north/south magnetic field that still allows compasses to work.
In fact, electromagnetism also plays a big part in the model's explanation for why things fall down. The model says that gravity actually does not exist, but rather attributes the fact that things fall down to the sky being positively charged and the ground being negatively charged. Basically, the model states that positive electric fields repel objects and negative ones attract them, and that the sky's repelling, positive field, and the ground's negative, attracting field combine to create the force that pulls objects downward. The rest of the model's explanation has to do with fluid buoyancy, offering it as the explanation for why the speed at which you fall down and which substances you can fall through as opposed to float on differ depending on the viscosity of the substance one is falling through (e.g. falling faster through air than through water) and the buoyancy of the object in question (e.g. why a rock will fall through water, but an inflated beachball will float on it).

Also, the Flat Earth model says that there's no such thing as the void of outer space, and that the earth is actually underwater, with the sky being a gas-filled dome of ice keeping us from the waters outside, with Antarctica being where the dome's wall touches sea level (although the upper interior of the dome would probably still be hard to breath in and black as night).

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    $\begingroup$ "Model" is being generous. "Lunatic ravings based on scientific ignorance" would be the more accurate definition. $\endgroup$ Nov 29, 2021 at 17:02
  • $\begingroup$ What's wrong with it? It explains why we don't have all our air floating out into a void. $\endgroup$ Dec 2, 2021 at 1:21
  • $\begingroup$ Just for one? Buoyancy requires gravity. $\endgroup$ Dec 2, 2021 at 2:02
  • $\begingroup$ Not if electromagnetism is present to determine which direction things fall. $\endgroup$ Dec 5, 2021 at 18:46
  • $\begingroup$ Except electromagnetism doesn't work that way. In any event, the discussion is pointless. I have personally spoken to people who have orbited the planet, so any type of argument for a Flat Earth out that isn't purely fantasy is, and how shall I put this gently....really goddamn stupid. $\endgroup$ Dec 6, 2021 at 4:59

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