1. The problem statement, all variables and given/known data The orbital elements (a,e,i,w,Omega,f) are to be integrated forward in time using two methods: 1) Cowell's method, which is direct interation, and 2) Gauss' Variational diffeential equations. The full assignment description, initial conditions, and my code are given in the attachment. 2. Relevant equations See page 488 of this reference: http://books.google.com/books?id=Oj...snippet&q=osculating orbital elements&f=false These equations are used in the attached code. 3. The attempt at a solution As can be seen from the attached code, my results do not match for the Cowell method and the Gauss' Variational method. These results should match, however. I can't figure out what I'm doing wrong! Any suggestions would be fantastic.