J.J. Müdespacher Mexico City, Mexico Earth's orbit around the Sun is not circular, but an ellipse that is slightly elongated with an eccentricity of 0.017. (An eccentricity of 0 is a circle ...

This barycenter is usually not equal to the central point of the ellipse ... observe the sun, then the difference in this path can be traced out and allows you to measure the eccentricity of ...