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Apollonios: investigations

A main focus of his investigations were the conic sections and the relations between them. This is reflected above all in Apollonios' eight-volume main work, the "Conica" (also: "Konnika"), whose title means something like "cuts". While the first four books of the "Conica" summarised and systematised the knowledge of the time about conic sections - do my assignment , the four other volumes contain their own research results. Apollonios assumes a uniform origin of conic sections (by intersection of a plane with one and the same circular cone at different angles of inclination). This allows a uniform treatment of all conic sections. In particular, the terms "ellipse" and "hyperbola" (Greek for "deficiency" and "surplus" respectively) go back to him.

As a special geometric locus, Apollonios examined the set of all points that are twice as far away from a given point A as from another given point B - . He found that these points are on the same plane as the other points. He determined that these points lie on a circle (the so-called Apollonios circle).

In the field of astronomy, Apollonios is considered the founder of the epicycle theory, which was later introduced into planetary theory by Hipparch - (c. 190 BC to c. 125 BC). According to this theory, the orbits of the planets are circles whose centres in turn move circularly around the Earth. This theory later became the basis of the geocentric world view of Ptolemaus (around 85 to about 165).

See also:

Сhemistry develop: Alchemy

Eminent scientists in chemistry: Robert Boyle

Physic: Energy topic

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Sam Albee
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