1. Ancient Vedic astrology (whom we get our precise moon phases from) says there is a third heavenly body that is unseen until eclipses. The are geo-centrists, but believe the world is a ball, but it doesn't move.

2. According to a sextant device, the sun could be 90 million miles away, or 3 thousand miles away, both are legitimate answers and a closer sun would produce the stick shadow effects on a flat earth that could hypothetically be created in a ball earth (if the earth was a globe and sun 93 million miles away). 

3. Classical artists started to understand the "laws of perspective" that we take for granted today. That's what you are describing being 1 inch or 6ft off the ground, or 20 miles off the earth, the horizon always rises to eye level, fact on our flat earth. Rising above a ball, the horizon would descend and fall away. 

4. So, Earth moves under a hypersonic bullet, but not under a helicopter? think again. 

5. Billions later, Virgin Galactic still hasn't gone to space