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9 votes
4 answers
896 views

When did humanity have the knowledge to prove this semi-flat world is an octagon?

The world below is flat. However, there are no endless walls of ice or force or magic - Instead, each side of the octagon "wraps" to the other side. That is, the North boundary wraps to the South ...
Andon's user avatar
  • 11.6k
15 votes
7 answers
455 views

How to navigate without magnetism?

Suppose a team of explorers touched down on an Earth-like planet which do not generate its own magnetic field and there are always a thick layer of cloud covering the sky at all time. My question is ...
user6760's user avatar
  • 48.1k