You don't need a book!!! trust your own eyes!
You can see a level 16 mile horizon (never curved).
NO straight line will ever become a circle(sphere).
Don't need foto's ,camara's , levels ,gps just your eyes and brains!
You don't need a book!!! trust your own eyes!
You can see a level 16 mile horizon (never curved).
NO straight line will ever become a circle(sphere).
Don't need foto's ,camara's , levels ,gps just your eyes and brains!