Why do you think the Earth is a Ball ?

[Dr.Henry_Killinger]

kljesta64 said:

Dr.Henry_Killinger said:
The temperature gradient between the poles and the equator is caused primarily by the Earth being spherical.
The Sun's rays hit more surface area in the poles because its curved.(near parallel 2 Sun), and less in the equator because its flatter(perpendicular). Since the heat is distributed over less area in the Equator, that heat is concentrated and its hotter. At the poles that heat is distributed over a large area, so it is diffused.

Also lunar eclipses.

i think i get all that ..but still dont see how it proves the earth to be round as you said 'curved' but not a ball not round a flat earth can also be curved.

Well their is no place on earth colder than the poles, so we know that is the point of maximum curvature. Because their are two, and because it gets warmer once you move away from the poles, you know it curves all the way around like a pipe. Latitudanally(from pole to equator to pole), with the poles being the tips and the equator being the sides. Now you have to prove it wraps longitudinally(east to west).

The easiest way to do that is to just go around the planet once, but when I say easiest I mean most naive.

The lunar eclipse is Earth's shadow projected onto the moon. It is always curved. If the earth was a pipe then at the edges of the pipe the shadow would have straight edges

so not only does it wrap, longitudinally(east-wes.t) and latitudinally(north-south) which would mean its a closed shape. It is curved north to south because of temperature, and curved east to west because of lunar eclipse.

Fun fact, it flat plains large enough to where you can see the horizon on the other side, like the ocean. You can actually see the curvature of the earth.