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Apollonius of Perga

By Caleb Kliewer

What we use in this calss

who was he?

It was Apollonius who gave the ellipse, the parabola, and the hyperbola the names by which we know them.

Apollonius was a Greek geometer and astronomer

He was also known as the "Great Geometer"

Apollonius was born in Perga, Pamphylia which is now in Antalya, Turkey. Perga was a center of culture at this time and it was the place of worship of Queen Artemis, a nature goddess

Fun Fact

Things he did

Apollonius also researched the lunar history. The crater Apollonius on the Moon is named in his honor.

Apollonius was also an important founder of Greek mathematical astronomy, which used geometrical models to explain planetary theory. Ptolemy in his book Syntaxis says Apollonius introduced systems of eccentric and epicyclic motion to explain the apparent motion of the planets across the sky.

Things he did

Apollonius shows how to draw a tangent to three given lines. In Tangencies, Apollonius shows how to construct the circle which is tangent to three given circles. More generally he shows how to construct the circle which is tangent to any three objects, where the objects are points or lines or circles.

Apollonius wrote 8 books known as conics. In book one the relations satisfied by the diameters and tangents of conics are studied while in book two Apollonius investigates how hyperbolas are related to their asymptotes.

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli

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