Gerard Roes paper  this Wiki text is obsolete   I just added this section because someone badly needs to update this completely obsolete article Because of the wellcited  article below pretty much all the criticisms in this Wikipedia article are out of touch The readers will be grateful to anyone who will update it  but the amount of required work is nontrivial  Many of the doubts about the theory disappeared in  when Gerard Roe published a paper In defense of Milankovitch in Geophysical Research Letters Vol  L doiGL   He correctly identified the insolation with the timederivative of the measured ice volume rather than the ice volume itself and obtained a spectacular agreement that has solved the year problem and other problems below By taking the derivative the shortduration higherfrequency cycles are amplified Until this text takes Roes paper into account you should realize that it is obsolete