What did Kepler do for the field of mathematics?

[Analys1s]

What were some of Kepler's mathematical concepts? After a little research, I have discovered Kepler's conjecture (the sphere packing), how ellipses (foci, eccentricity, etc) correspond to Kepler's first law, and a few formulas here and there. What else did he do?

 

[epenguin]

The first ideas explaining crystals, hexagaonal close packing, snowflakes. In book called 'New year's gift of a snowflake'. Had right idea though missed something and didn't get it quite right.

Some fancy polyhedra.