Note 21 — INTRODUCTION.
Reading edition
John Kepler, a native of Wiel in the duchy of Wirtemberg, in Germany, became as celebrated for the consequences he drew from the observations of Tycho, as the latter was for the vast mass of astronomical materials he had prepared. This eminent, though somewhat “whimsical”[21a] astronomer, was born the 27th of December, 1571, and died at the age of fifty-nine years.