How as an individual can I know if the Earth is a sphere or a flat disc? What experiment can I do that doesn't involve trusting information from a 3rd party that would prove what the geometry really is?
http://i.imgur.com/O8IpMmi.jpgIt's easy just take a stick place it in one place then take another stick place it a few miles away and when you drive from one place to another you will see the shadows are different which means is not a flat disc
