The title page of Kepler’s “Harmonices Mundi” (1619), in which he advanced his third law. (Courtesy of Jay M. Pasachoff)

Published October 19, 2015 at 373 × 500 in Historical Documents

The title page of Kepler’s “Harmonices Mundi” (1619),
in which he advanced his third law.
(Courtesy of Jay M. Pasachoff)