c. 370-c. 300 B.C. Greek Astronomer and Mathematician Callipus is famous for refining the planetary theory of Eudoxus by adding additional spheres. He also made accurate determinations of the lengths of the seasons and constructed a 76-year period to...

c. 370-c. 310 B.C. Greek astronomer and mathematician who used mathematical astronomy for a number of purposes, including the creation of a 76-year cycle that aligned the solar and lunar years. Later astronomers used the 940-month calendar of...

Callippus or Calippus (Greek: Κάλλιπος; ca. 370 BC–ca. 300 BC) was a Greek astronomer and mathematician. He was born at Cyzicus, and studied under Eudoxus of Cnidus at the Academy of Plato. He also worked with Aristotle at the Lyceum,...