Flat Earth?

Can someone explain this?

I wrote a longer article showing how to check for yourself if the Earth is flat, but here’s a simpler, quicker, and more direct argument.

Pendulum’s swing back and forth in a fixed plane, but over time that plane rotates around. In fact, at the North and South Poles the plane swings around exactly a full circle in one day, as the Earth rotates in space a full circle underneath the pendulum.

At the equator, a pendulum’s swing does not rotate around at all.

Foucalt pendulums knock over markers as the Earth rotates. Image Courtesy of Civilsdaily.

The experts figured out that the rotation of the swing plane of a pendulum varies with latitude. If you’re interested in the math, the rotation is 360 degrees per day times the sine of the latitude.

The more massive the pendulum, and the longer the suspension cord is, the more accurate the swing is due to the elimination of air currents and other external effects.

Back in February of 1851, the first Foucault pendulum was hung and started swinging at the Paris Observatory. Since then, dozens, if not hundreds, of large pendulums have been set up all around the Earth, including at the Amundsen-Scott station located at the South Pole, where the swing plane does rotate a full circle daily.