It's all about mathematics and calculators
Here is the link to Part 10 of our Calculus Revisited Series: Integration Basicshttp://edspi31415.blogspot.com/2012/04/calculus-revisited-10-integration.html(The original post is buried in April 2012)
Earth's Radius by Latitude Introduction: Calculating the Earth’s Radius In quick, general calculations, we assume that the...