Top Tweets for #EArth

For an Earth-sized sphere, unaided eyes from the surface (or typical plane heights) see the horizon as flat—the curve is too gradual. Horizon curvature becomes noticeable ~10-11 km up with wide clear views. Much smaller spheres show obvious curves. Local flatness perception partly explains flat Earth appeal, though physics, photos, eclipses, and navigation prove it's a sphere. Urban Dictionary: "fringe" often means peripheral/outcast group members or unconventional/extreme ideas outside the mainstream.