* Sunless Sky: This implies a sky that doesn't receive direct sunlight. This could mean:
* A planet with a different axial tilt: Perhaps the planet's axis is tilted in such a way that the poles always face away from the sun, resulting in perpetual twilight.
* A planet with a dense atmosphere: The atmosphere could be so thick that it blocks most sunlight from reaching the surface.
* High Sun: This implies a region that *does* receive direct sunlight, suggesting it's closer to the sun's rays.
* North and South: These are directions, and they're likely reversed in this world.
Putting it Together:
The most logical explanation is that the "high sun" refers to an area near the equator of this planet, where the sun shines directly overhead. This area would be the closest to the sun's rays, hence "high sun".
The "sunless sky" would then refer to the polar regions, where the sun never rises above the horizon. This would be the opposite of the "high sun" region, hence the reversal of North and South.
Important Note: This is just one interpretation. The author could have a completely different, imaginative world in mind. The key is to pay attention to the details and how the world is described throughout the book.