I've been having a real hard time finding the information I seek. Anyone familiar with the Milankovitch Cycle?

Anyway, I'm seeking to quantify something I have never seen reference too within the theory. Milankovich's theory is tied to the ice ages, and the usage of 65 degrees insolation is used. I believe that is an inappropriate measure as the oceans are also warmed by these changes.

I am looking for the annual average energy received by the earth over long periods of time. First of all, the elliptical orbit changes from a near circular orbit to a small eccentricity of 0.058. I have never seen reference to the total radiation received, only at 65 degrees. The simple answer is that as the earth is in a more circular orbit, global temperature rises. As the earth is in a more elliptical orbit, the aphelion is not only is farther away, but the earth spends even more time at the longer distances, hence, the annual average temperature decreases.

This cannot be immediately assumed. The other factor critical in this determination is the speed and distance of the earth. The problem cannot be solved without knowing more data. For example. We are in a current orbit of 365.256366 days. If this remained constant for all eccentricity values, then it can be calculated. What if the value changes a bit? What if 100,000 years ago it was 370 days? That would mean a greater average distance from the sun and less solar radiation. What if it was 360 days? Then we would be orbiting close and have more radiation.

Anyone know where I can find more detailed information of the earth's orbit over time?