**Work in Mathematics and Physics**

As a New Year's gift that year, he also composed for his friend and some-time patron Baron Wackher von Wackhenfels a short pamphlet entitled *Strena Seu de Nive Sexangula* (*A New Year's Gift of Hexagonal Snow*). In this treatise, he published the first description of the hexagonal symmetry of snowflakes and, extending the discussion into a hypothetical atomistic physical basis for the symmetry and posed what later became known as the Kepler conjecture, a statement about the most efficient arrangement for packing spheres. Kepler was one of the pioneers of the mathematical applications of infinitesimals, see Law of Continuity.

Read more about this topic: Johannes Kepler

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