Ah! an intriguing quiz you purpose Hastur, and one that in simplest form is dependent on which theorem you would hold as true…
The Whitelanders and Raphaelian’s provide paradigm, they would tell you the world is not flat, but raised in an arc from the lowest points off the east and west coasts of the great landmass, up to the high ridge of the Worlds Keel mountains.
They purport the whole of Uma is in fact placed on the hull of a great ship as it ploughs through the ether, the mountains are literally named for this reason. The sky is actually the fluid that the world carves through and the clouds are the great swirls of wake-foam stirred down from the heavens we cannot see far above the other side of the ship’s hull where the gods stand upon the world deck guiding its passage.
Their wise men would point to the breaking and slipping of the land into islands and then just trackless sea as evidence of the rise up the hull towards the ether-above. To them the flora and fauna of Uma are but the weeds and barnacles clinging precariously to the great vessel, with a similar amount of influence over its destiny.
Other cultures have other opinions of equal apparent veracity. The Uru think the world a disk upon which they crashed in a ship of fire from some other place. And they believe their distant gods still try to find them to punish them for the collision.
The Yerwi say the world a living creature, no doubt they think her swimming and bobbing about and we as but fleas and mites upon her back!
But enough of these others, here in the greatest city on all Uma, Hastur is able to draw comprehension from greater minds then these primitive storytellers.
When we compare the experienced perception of the Dromish, explicated from their Daemonic tutors and great planographia apparatus, with the keen insight of the greatest Pelosian thinkers, who have been able to map the movement of the heavens and proved and calculated the exact curve of the land then Hastur will confidently construe this.
Uma is a sphere.
Further, the land and sea are its surface with boiling magma beneath, as the shell is to the yolk of an egg.
Pelo’s method and Planological proof concludes moreover that the sphere of Uma spins completely every twenty-four hours on its axis, which passes through one point somewhere far beyond the trackless reaches of the Whitelands, and the other point a great reach beyond even distant Uruwei.
Hastur can even say with surety that the Orbis Terrarum as the Pelosian’s name it, completes an orbit of the sun every three hundred and ninety two days, during which there is the passing of seven Munes, eight Lunes, one shining of the Girdle of Majhbé and a single wax and wane of the malevolent Bloody Cloud…
Yes, Hastur did say that the very globe moves around the sun... A complex dance in the heavens, encompassing all the other stars, each in turn perhaps having their own worlds…
…Bah! Hastur could continue to elucidate, but sees the growing look of disbelief upon your face, so finds it time to away to his rest.