The Thomas Harriot Plaque in the grounds of Syon House (W. London) —
Photo Credit: By The group organising the Telescope 400 event (July 2009) - I am a member. - The group organising the Telescope 400 event (July 2009), CC0, https://commons.wikimedia.org/w/index.php?curid=16380312

Harriot's 1609 Drawing of the Moon —
Photo Credit: by Thomas Harriot: Public Domain

Thomas Harriot —
Photo Credit: By Unknown - http://www.ecu.edu/cs-cas/images/harriot.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3994065

Alfonsine tables —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=777363

Alfonso X — cropped from: Monument to Alfonso X in La Puebla del Río, province of Seville.
Photo Credit: By The original uploader was Asterion at English Wikipedia. - Transferred from en.wikipedia to Commons by Kafuffle using CommonsHelper., CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=12867166

Hipparchos —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=630396

Kepler's Trigon — A diagram of great conjunctions by Johannes Kepler. While teaching, he had the striking realization that a circle was inscribed by the periodic occurrence of the conjunctions and that might be related to the orbits of the plants.
Photo Credit: By Johannes Kepler - De Stella Nova in pede Serpentarii (1606), Public Domain, https://commons.wikimedia.org/w/index.php?curid=16622989

Monument to Tycho Brahe and Kepler in Prague, Czech Republic —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=859398

Kepler's Platonic solid model of the Solar system — By Johannes Kepler from his Mysterium Cosmographicum Tübingen 1596
Photo Credit: Johannes Kepler: Public Domain, https://commons.wikimedia.org/w/index.php?curid=37300

Jacques-Yves Cousteau and Émile Gagnan — Co-inventors of SCUBA
Photo Credit: Fair Use

Jacques Cousteau — In his iconic red cap
Photo Credit: The Cousteau Society