James IV & I c. 1606 — cropped
Photo Credit: By John de Critz, Public Domain, https://commons.wikimedia.org/w/index.php?curid=6370398

The Great comet of 1577 — seen over Prague on November 12
Photo Credit: By Jiřrí Jakubuv Dačický - Zentralbibliothek Zürich, Public Domain, https://commons.wikimedia.org/w/index.php?curid=70591808

Brahe's mural quadrant — The quadrant (radius c. 194cm) was made from brass and was affixed to a wall that was oriented precisely north-south. The observer (right) views a star through the opposite opening (upper left) to determine the star's altitude as it passes through the meridian. An assistant (lower right) reads the time off a clock and another one (lower left) records the measurements. The area above the quadrant is filled with a mural painting showing several other of Brahe's instruments. See Brahe's description.
Photo Credit: Engraving from the book: Tycho Brahe (1598), Astronomiae instauratae mechanica, Wandsbeck. Downloaded from the online exhibition at the Royal Library; stitching by Axel Boldt, Public Domain, https://commons.wikimedia.org/w/index.php?curid=19389032

Uraniborg main building — from the 1663 Blaeu's Atlas Major
Photo Credit: By Blaeu - Blaeu's Atlas Major, Public Domain, https://commons.wikimedia.org/w/index.php?curid=1302199

Tycho Brahe's Uraniborg — from his book Astronomiae instauratae mechanica (1598)
Photo Credit: By Tycho Brahe - Transferred from en.wikipedia to Commons. Original uploader was Wikibob at en.wikipedia on 2004-07-04 (original upload date), Public Domain, https://commons.wikimedia.org/w/index.php?curid=1920637

Observations by Brahe of the Great Comet of 1577 —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=1836840

Kepler's model — Close-up of an inner section of Kepler's model
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=37301

Kepler's birthplace, in Weil der Stadt —
Photo Credit: By MarkusHagenlocher, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1786865

Johannes Kepler — Cropped from the GDR stamp featuring Kepler
Photo Credit: By Hochgeladen von --Nightflyer (talk) 19:29, 10 October 2009 (UTC) - German post, Public Domain, https://commons.wikimedia.org/w/index.php?curid=8031144

Venus — Global radar view of Venus (without the clouds) from Magellan between 1990 and 1994
Photo Credit: By NASA - http://photojournal.jpl.nasa.gov/catalog/PIA00104, Public Domain, https://commons.wikimedia.org/w/index.php?curid=11826

Page from Tycho Brahe's De nova stella — Star map of the constellation Cassiopeia showing the position of the Supernova of 1572. The labeled stars are: A caput Caßiopeæ (ζ Cas) B pectus Schedir. (α Cas) C Cingulum (η Cas) D flexura ad Ilia (γ Cas) E Genu (δ Cas) F Pes (ε Cas) G suprema Cathedræ (β Cas) H media Chatedræ (κ Cas) I Noua stella. (SN 1572)
Photo Credit: By Tycho Brahe - Brahe, Tychonis (1573) Public Domain, https://commons.wikimedia.org/w/index.php?curid=14312843