Name the astronomer, who, in the 1920's, found a correlation between the Earth's climatic variations and three aspects of the Earth's orbit relative to the Sun? Those three factors were:- 1)The shape of Earth’s orbit, known as eccentricity; 2)The angle Earth’s axis is tilted with respect to Earth’s orbital plane, known as obliquity; and 3) The direction Earth’s axis of rotation is pointed, known as precession.