TIL that for a 6' tall person at sea level, the horizon is 3 miles distant
https://mathcentral.uregina.ca/qq/database/qq.09.03/judy1.html
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1ppt7jn/til_that_for_a_6_tall_person_at_sea_level_the/