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Found 2 results

  1. So to those of you who have read Aether of Night I think that the Midnight sea Aether is ferrous since this would be incredibly terrifying and give the Sorceress a very scary reputation since the Aethers upon ingestion and exposure to liquid might have an effect similar to making you a Corpate you would become a slave to the sorceress. Thoughts?
  2. Lumar, Tress's planet in SP1, has 12 moons which are apparently all in geostationary orbit above oceans of their corresponding spores, at points called Lunagrees. (Sidenote: perhaps derived from perigee, the closest approach of our Moon to the Earth? Except peri- means nearest and -gee means Earth, so the etymology doesn't really work). The only possible geostationary orbits (with standard orbital mechanics) are orbits directly above the equator, so the only possible configuration is with all 12 moons orbiting in the same direction around the equator: Note: they don't technically have to be equally spaced since they are all moving at the same speed and thus will not directly collide, but they would either get gravitationally attracted to their nearer neighbor (if not equally spaced) and collide eventually, or perhaps tidal forces would pull them into equally spaced orbits over time. However, Brandon has stated in a WoB (https://wob.coppermind.net/events/490/#e15444) that he envisioned the moons to be arranged more like the vertices of an icosahedron, equally spaced in 3d space rather than just around the equator. The icosahedron is the shape of a D20 die, which has 12 corners and 20 faces. In order for such an arrangement to be geostationary, the icosahedron would have to orbit rigidly, and below are two such symmetric configurations, which I've dubbed pointy-topped and flat-topped: Pointy-topped: this configuration has 5 fold symmetry: 2 moons over the poles, and 2x5 moons on inclined orbits. Flat-topped: this configuration has 3 fold symmetry: 4 offset rings of 3 moons each. Personally, I think the flat-topped configuration looks cooler, and is slightly more feasible: the moons are closer to the equator, and there aren't stationary hovering moons over the poles. Unfortunately, these orbits are not physical, since the moons are orbiting a central axis (i.e. cylindrically) rather than the center of mass of the spherical planet. If we instead consider the moons to be geosynchronous rather than geostationary (i.e. orbits once per day but not necessarily over exactly the same spot), and minimize non-axial angular momentum, we get this pattern (for flat-topped): This corresponds to 6 pairs of circular orbits. Unfortunately, this configuration is not actually possible, as the moons would collide over the equator. This can be clearly seen if we enter the frame rotating with the planet: But don't worry: there is a configuration for the flat-topped icosahedron that does not have the issue of colliding moons: Now, while this initially seems chaotic, it actually has more symmetry than the previous pattern. It consists of 3 groups of 4 moons in circular orbits along 3 orthogonal axes (of 3d space). And, if we enter the geosynchronous frame, we can see that the moons follow staggered orbits along figure-8 paths such that they don't collide. This is cool and all, but unfortunately this still doesn't really work with the spore oceans that Brandon has set up, which seem to require each moon to have its own ocean, and thus not share its space with other moons. Also, while the moons would form an icosahedron in the sky twice a day, they are not permanently in that nice D20 shape. Finally, I'm not certain these orbits are stable, with the moons constantly moving closer and further away from the other moons. So, in the end, we must return to the rigid icosahedral orbits, which look very cool but are not physical... yet.