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The astrolabe is an astronomical instrument used from around the 6th century to measure time and position by determining the altitude of heavenly bodies like the Sun and certain stars. Measurements were taken in reference to the viewer's...

Claudius Ptolemy (c. 100 to c. 170 CE) was an Alexandrian mathematician, astronomer, and geographer. His works survived antiquity and the Middle Ages intact, and his theories, particularly on a geocentric model of the universe with planets...

John Cabot (aka Giovanni Caboto, c. 1450 - c. 1498 CE) was an Italian explorer who famously visited the eastern coast of Canada in 1497 CE and 1498 CE in his ship the Mathew (also spelt Matthew). Sponsored by Henry VII of England (r. 1485-1509...

Andreas Vesalius (1514-1564) was the most celebrated anatomist in Europe during the 16th century and a key figure of the Scientific Revolution. Vesalius' great work was his On the Fabric of the Human Body, which contains over 250 remarkable...

Cerberus (also spelt Kerberos) is a vicious three-headed dog in Greek mythology, who guards the entrance to the underworld. He allowed the souls of the dead to enter Hades but prevented the living (except for a few exceptions) from entering...

Jan van Eyck (c. 1390-1441 CE) was a Netherlandish Renaissance painter who was famous in his own lifetime for his mastery of oil painting, colouring, naturalistic scenes, and eye for detail. Amongst his masterpieces are the 1432 CE Ghent...

Georges Bizet (1838-1875) was a French Romantic composer best known for his opera Carmen and the instrumental music for the play L'Arlésienne. None of his earlier operas had enjoyed any great success, and even Carmen took several months to...

Hipparchus of Nicea (l. c. 190 - c. 120 BCE) was a Greek astronomer, geographer, and mathematician regarded as the greatest astronomer of antiquity and one of the greatest of all time. He is best known for his discovery of the precession...

Aristarchus of Samos (l. c. 310 - c. 230 BCE) was a Greek astronomer who first proposed a heliocentric model of the universe in which the sun, not the earth, was at the center. Although his theory was noted by other thinkers of his time...

Robert Hooke (1635-1703) was an English scientist, architect, and natural philosopher who became a key figure in the Scientific Revolution. Hooke conducted his scientific experiments outside the auspices of universities, and he was a great...