Lol it's never been measured by anyone. That's because it's not real.
Do you feel a force pushing down on your arm when you lift it? You might get tired holding it up, but there's no force pushing it down.
Why does gravity keep the billions of gallons of water stuck to the earth but a feather can float with no problem?
They say the tides change because of the moons gravity. This is BS because the moon is like 1/8 the size of the supposed ball earth, and therefore it would not be pulling anything away from earth that was on earth. Also, why doesn't this same moon gravity affect lakes and ponds and rivers this same way.
It's because gravity is BS.
Gravity has been measured. It's an force that arises because of the constant acceleration of of 9.8m/s^2. Force = mass * acceleration. Anything with mass experiences the force of gravity.
Gravity pulls you down it doesn't push down. The force is constant so you don't feel it in the same sense as someone pushing you because the force is there *all the time*. You get tired holding your arm up because you have to use energy to keep your arm up against the force of gravity.
Gravity keeps billions of gallons of water on the earth because it's massive.
A feather can float because although it's pulled down by gravity it is also in a fluid, with oxygen and other gases which also exert a force on the feather, but still the feather will eventually come to the ground, unless there's some wind to keep it up.
Lastly, I don't believe the tides change because of the moon's gravity.