The shape of Earth

[polymath257]

We have a number of ways of telling the shape of the earth.
1: We have a working physics that says that a body the size of the earth should be a sphere because of gravity.
2: we can observe other bodies of a similar size and see that they are spheres.
3: we have photos and videos from space showing the earth as a sphere.
4: from ancient times they were able to work not only that the earth was a sphere but were able to work out approximately how big a sphere. They did this by finding a well tha the sun shone directly down, at exactly the same time they measured the shadow on sticks to the east and west of the well on flat ground. by measuring the shadow they could work out the angle that world was tilted by and extrapolated the circumference.

So we do know what shape the world is.

1. What is gravity? How do you know that mass pulls on mass? I have observed that what goes up must come down based on buoyancy and density. Why does a stone sink and why does a helium balloon defy gravity?

The force on an object is the sum of the gravitational force going down and the buoyant force going up. The sum determines the direction of acceleration.

If you remove the air in a container, the balloon will also fall downwards because there would be no buoyant force.

2. If billiards are spheres how can the table be flat? Have you ever used your own telescope to look at a wandering star?

Yes, I have. I have looked at planets many times through my own telescope. Jupiter and Saturn are the easiest ones (being quite large). Both are clearly round and the rings of Saturn are easily seen. Mars is also clearly round and you can often see markings to witness rotation. Venus varies in size and brightness in a vary interesting way that shows it is orbiting the sun.

Any surface looks flat on a small enough scale.

3. From which source? Could that source have the funding to produce fakes?

Sure. But why?

4. Already addressed this argument but Aristophanes proved that IF the sun was much larger and much further away from Earth then he could determine Earth's curvature using a well and a long pole. 
The problem with his measurements is that his first assumptions could be wrong. 
So no Aristophanes did not prove Earth's curvature because he failed to prove that the sun was much larger than Earth. 
Nor did he prove that all of the sun's rays hit earth in parallel (as you can observe in many photos of light passing through our clouds).

Also, we have plenty of independent high-altitude footage available on BitChute which shows localized hotspots underneath the Sun.

It is easy to determine the distance to the moon using basic geometry. it is clear from eclipses that he sun is farther away than the moon.

Using the phases of Venus (observable through a telescope), it is clear that Venus orbits the sun, is a sphere, and is farther away than the moon.

Given the trigonometry between the moon and Venus, it is then clear that the sun is very far away compared to the moon.

All of this is visible with a fairly simple telescope.

As for masses attracting other masses, it is possible to perform the Cavendish experiment at home.