X-ray, Optical & Infrared Composite of Kepler's Supernova Remnant — On October 9, 1604, sky watchers -- including astronomer Johannes Kepler, spotted a "new star" in the western sky, rivaling the brilliance of nearby planets. "Kepler's supernova" was the last exploding supernova seen in our Milky Way galaxy. Observers used only their eyes to study it, because the telescope had not yet been invented.
Photo Credit: By NASA/ESA/JHU/R.Sankrit & W.Blair - http://www.nasa.gov/multimedia/imagegallery/image_feature_219.html, Public Domain, https://commons.wikimedia.org/w/index.php?curid=14301

De revolutionibus, 1543, title page — by Copernicus
Photo Credit: Public Domain https://en.wikipedia.org/wiki/File:Nicolai_Copernici_torinensis_De_revolutionibus_orbium_coelestium.djvu

Copernicus — Nicolaus Copernicus portrait from Town Hall in Toruń - 1580)
Photo Credit: By Unknown - http://www.frombork.art.pl/Ang10.htm, Public Domain, https://commons.wikimedia.org/w/index.php?curid=113500

A plate from Astronomiae Pars Optica — Illustrates the structure of eyes of various species
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=763931

Title Page of Kepler's Astronomiae pars optica —
Photo Credit: By Kepler, Johannes - Available in the BEIC digital library and uploaded in partnership with BEIC Foundation., Public Domain, https://commons.wikimedia.org/w/index.php?curid=38722962

Geometrical harmonies in the perfect solids — from Harmonices Mundi (1619)
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=1786757

Statue of Kepler in Linz — Statue of Johannes Kepler in gardens at the Linzer Schloss. Kepler lived and worked in Linz (from 1612 to 1630), and a university there bears his name.
Photo Credit: By Aldaron, a.k.a. Aldaron - Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=5588115

Mars apparent retrograde motion — Diagram of the geocentric trajectory of Mars through several periods of apparent retrograde motion (Astronomia nova, Chapter 1, 1609)
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=1164908

Title Page of Kepler's Harmonices Mundi — 1619 first edition
Photo Credit: By Johannes Kepler, Public Domain, https://commons.wikimedia.org/w/index.php?curid=9486143

The three models of planetary motion prior to Kepler — Page 132 of Johannes Kepler's Astronomia Nova
Photo Credit: By Johannes Kepler - http://www.library.usyd.edu.au/libraries/rare/modernity/kepler4.html, Public Domain, https://commons.wikimedia.org/w/index.php?curid=306735

Title Page of Kepler's Astronomia Nova —
Photo Credit: By Johannes Kepler - http://www.library.usyd.edu.au/libraries/rare/modernity/kepler4.html, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1575517