## Curvature: computations with illustrative formulas

Curvature, yes. Earth’s curvature is a topic about which a number of calculations are available: you just need surfing the net and search for everything you want. A great number of images, posts, and videos show full evidence there is no curvature. Notwithstanding, I want to discuss the topic all the same. In fact, it touches our senses in a very sensible way. I’m going to deal first with computations and then with some example.[…]

## Eratosthenes’ experiment proves the earth is flat

here you can find out book “Dossier 111-The real measures of the (flat) Earth.” Eratosthenes was a Greek mathematician born in Cyrene in 276 B.C. He was not the first one describing the Earth as a sphere. Plato and Aristotle had done before.  Aristotle’s disciple, Plato, wrote that the Creator “made the world in the form of a globe, round as for a lathe, having its extremes in every direction equidistant from the centre, the[…]

## Isotropy and Einstein’s Special Relativity

Isotropy and the growth rings of a tree Isotropy is uniformity in all orientations. So, in this lecture, the reader will find a brief inquiry into an old alchemic principle. Our universe shows everywhere uniformity and auto-similarity. So it appears the same from any position. In order to explain this reality, Einstein elaborated and achieved his special relativity theory.