> I wonder about the gravity field on the planet itself, just disregarding
> the speed of rotation. Seems to me that on the outer radius, the gravity
> is strong. On the inner radius, to avoid getting attracted to the sky,
> it is weaker and push some constraints between the major & minor radius
> (so that the ground is stronger than the sky part).
> But on the upper/bottom side(circle) of the torus, it seems that, if the
> ground is just along the torus, the direction of a free water surface
> would not be parallel to the ground. Wouldn't there be a kind of
> desert/cliff making the transition on the small circle between both
> region ? would it be some desert or waterfall ?
>
> What about the clouds ? Isn't the atmosphere somehow more extended
> inside than outside of the torus ?
> What about the difference on the wildlife & flora due to the various
> strength of gravity ? (and the cubic/square rule)
> Is the daily rotation around the main axis (which might means a 6-month
> day if the rotation axis is not aligned with the plane of revolution, or
> an ever dim inside-band if they are (well, maybe the shadow cast by the
> other side is not large enough to hide the sun, so: umbra, penumbra or
> just a bit less light, according to the relative apparent radius of the
> sun/minor radius of the planet)

The torus is actually "in orbit around itself," with gravity perpendicular to
the surface...though it might be distorted from a torus.  It should spin in
about 12 hours or 24 hours or so.

Below is another picture, with some description:

http://www.orionsarm.com/eg-article/49142c044cba7

Below is a further discussion, and also a discussion of how it is not in stable
equilibrium.

http://cosmoquest.org/forum/archive/index.php/t-27790.html

For this picture, I assumed the minor diameter is 4000 km, and the major
diameter is 100,000 km.

It would be built artificially...though heaven only knows who would have the
technology to build something like this, and why anyone would try since it's not
really stable...

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