Transcript:

So, let's look at the Tesla 369 argument a little bit more. One of the key arguments is that there are 360 degrees in a circle, and if you keep dividing 360 by 2, so 180, 90, etc., the digital sum always remains 9.

But 360 degrees is an approximation of the angle subtended at the centre of the circle by the circumference. The technically correct answer is 2π radians. One radian is defined as the angle subtended by the circumference equal in length to one radius. That is one radian. That circumference subtends an angle of one radian.

360 is inherited from the Babylonians. The Babylonians had a base 60 numbering system, and then the equilateral triangle was defined as having an angle of 60, and 6 of these, when put side by side, form a circle, and the circle was therefore 360 degrees.

So, 360 degrees is an approximation. This is not technically correct. So when Tesla makes an argument with 360 degrees in a circle, I don't think that is right. I don't think Tesla meant it like that.

So there is more to it.