Noun;
A person who genuinely believes that the Earth is a flat plane (typically also stationed at
the center of the universe). They reject all objective, scientific proofs that have supported the shape of the Earth being a globe (technically an oblate spheroid).
The Flat Earth Theory has many flaws, including - but not limited to: (1) failure to construct a unified model that can explain all aspects of the Flat Earth Theory, (2) weather and seasonal patterns cannot be explained, (3) failure to explain the revolution of the Sun and the Moon, (4) Flat Earther use
Electromagnetism to explain gravity, yet fail to account for many instances which suggest the contrary (mass attracting mass), (5) fail to understand what
Conservation of Momentum is, etc.
The Flat Earth view is based off of the fact that the Earth is perceived as a flat plane. This does not serve as empirical evidence as to notice a 0.1° incline on the equator (facing parallel), the object must be around 69.1 miles away.
I believe the Flat Earther are in some kind of Flat Earth religion.
Flat Earthers were once willing to go to Antartica to prove their stance, but when the
opportunity arose, they quickly backed out, because they knew a 24 hour sun would destroy their entire
foundation.