Eccentricity and Seasonal Insolation
		q Small variations in received insolation do occur in connection with Earth’s eccentric orbit about the Sun, but these appear only as changes in the total energy received by the entire Earth, not as  seasonal variations. q Compared to the changes in seasonal insolation of 10% or more that occur at the tilt and precession cycles, these annual eccentricity changes are smaller by a factor of 50 or more.