http://book.klll.cc/ebooks/author/43585.opds?sort_order=release_date 2025-11-17T21:17:35Z Books by Kepler, Johannes Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-11-17T21:17:35Z https://en.wikipedia.org/wiki/Johannes_Kepler See also: en.wikipedia 2025-11-17T21:17:35Z https://book.klll.cc/ebooks/46036.opds The sidereal messenger of Galileo Galilei : and a part of the preface to Kepler's Dioptrics containing the original account of Galileo's astronomical discoveries Galileo Galilei and Johannes Kepler