A simple and intuitive method to determinate the excentricity of Earth's orbit around the Sun

Abstract

It is known from textbooks that the orbit f the planets are ellipses. Thus, the Earth does not escape this fact. Is it possible, with very simplemeans, both in equipment as the mathematical point of view, determine the eccentricity of the orbit of our planet around the Sun? That is the purpose of this article. It can satisfy some reader’s curiosity, who want to make the necessary measurements and compare their own results with those that are seen in books, it can still form the basis of a work program in a High School, to students of a School Group or of an Astronomy Scientific Club. The fact that it can be done during the day, on two occasions of the school year, is na additional favorable circumstance.