What is Milankovitch parameters?

The Milankovitch parameters are the three orbital quantities that set the distribution of sunlight over the Earth through the seasons and the latitudes: the eccentricity $e$, the obliquity $\varepsilon$ and the climatic precession $e\sin\varpi$. The Milankovitch theory states that their slow variations pace the growth and decay of the Quaternary ice sheets, through the summer insolation at high northern latitudes.