Great thred, Thof!
Seer of Yhog wrote:
This is a very good question. I did a quick search and I came up with this article
by LoZompatore, which assumes the same tilt as Earth but does present some implications of such a tilt (namely, that light from the sun would filter through the polar openings for at least part of the year).
Hmm. This phenomenon could be percieved by the Hollow Worlders as being something similar to the Northern Lights/Southern Lights in the real-world. They might not even realise there is another sun out there. Sages might think it is something to do with their own sun and some sort of force that bounces light back.
Ashtagon wrote:Well, the pre-cataclysmic maps and comparing equator lines pre and post-cataclysm aren't really a guide in this case -- the cataclysm canonically did cause the world to change its axis after all. It is quite possible that the planet had different axial tilts pre and post cataclysm.
Aren't the tropics of M-Cancer and M-Capricorn marked on some of the maps? That, by definition, is a canonical answer to this question. If we have M-Arctic and/or M-Antarctic circles marked, that too would answer this question conclusively..
Unless the world flipped over 180 degrees, I would agree that you would need to have two different tilts.
Do you (or anyone else) have the exact quote from the stuff about the cataclysm? Perhaps we can infer if the cataclysm made the tilt larger or smaller.
Thorf wrote:Hehe, yes - the Hollow World maps all show tropics and arctic/antarctic circles, even the Precataclysmic map.
And they all show them at the same levels. In other words, going by the tropics, the axial tilt didn't change at all.
At this point I'm pretty sure the Atlas will be going with 23.44 degrees.
That would seem to be an error (no offense to the designers intended). I think the thing with the fantasy worlds that TSR created is that some of them are such epic concepts (including the idea of a Hollow World) that you could probably do a degree-level of study in how the fantasy rules of nature would affect the people living on those worlds. I don't think that designers have the time to flesh out all the really wacky ideas to the nth degree. In a way I think that the more vanilla campaign settings are slightly easier to deal with, as you can use real-world assumptions about things like the effects of the moon on tides.
Ambreville wrote:One might wonder what the effect of conflicting gravity/gravities might be near the polar openings. HW gravity pushes outward. Outer World gravity draws inward. Therefore, there could be a spot in mid air where gravity is equal to zero. Isn't it so? Gravity on the surface, including the lip, would however remain constant. Shaping the space where gravity is nullified could be interesting (is there an astrophysicist aboard?)
I know a lot less about "Heardian laws of nature" than "Grubbian laws of nature", but I would concur that you would get a zone (actually a sphere - or a distorted sphere) where internal and external gravity would balance.
Within the world, that zone would probably have super high pressure (from the weight of both the internal and external continents).
In the Polar Openings, it could be a zero gravity zone. But that really depends on how gravity fits the surface of the world. If gravity is "ground hugging" it could just "bend" around the curvature of the openings and allow a person to walk through the Polar Openings. If that was the case (and I don't have the sources to check) you might instead get a line of zero gravity that went through the middle of both Polar Openings (and the internal sun).
I think that either way would be a valid way to design the world's gravity.