[N]either this nor that supposition is worthy of the name of an astronomical hypothesis, but rather that which is implied in both alike.

Frisch, Vol. I, p. 238; Burtt describes this summary statement as describing Kepler's thought: [O]f a number of variant hypotheses about the same facts, that one is true which shows why facts, which in the other hypotheses remain unrelated, are as they are, i.e., which demonstrates their orderly and rational mathematical connexion. p. 54.