There is no satisfactory explanation for glaciation cycles because the theories proposed impose a fixed periodicity that is not found in the data; as well the progress of both the rise to glacial maximum and fall to interglacial are interrupted by brief reversals at millennial time scales as seen in the video above that shows the formation and decay phases of the Last Glacial Period

These time scales are not integer multiples of the precession period

as the ice gets thicker it acts as insulation and allows internal heat from the earth to melt the bottom of the ice and cause glacial flows

But this is not always the case in nature.

In these systems many different “equilibrium” states are possible

We propose that ice formation in the northern continents is such a system

the non-periodicity of these events

ice is melted by heat that the planet has absorbed from sunlight; and the heat absorbed by the planet is a function of the ice fraction because ice reflects sunlight.