Imagine that the Hollow Earth theory is actually right. We've been living inside a planet shell. The gravity: we are "glued" to the ground, unlike this explanation that conclude we are should be in zero gravity.
I imagine that a person can sail/trek around the earth, and conclude that earth is spherical. Yes, but you're living in it, not on it.
So, by circumnavigation, can one deduce that they are living within earth, as opposed to on earth? I'm interested in "simple ways", and scientific ways.
Note: They've been living there for ages.
- Perpetual day, means no night. The light source is a "sun" in the center of the shell. The light is just similarly blinding like the sun.
- Atmosphere pressure is reduced when you go to the center.
- Opposite side is not visible.
- How the gravity works? Just like you got pulled to the ground perpendicularly.