Circa 150 BCE

Abut 150 BCE Hellenistic astronomer, geographer, and mathematician, Hipparchos of Rhodes, produced a table of chords— an early example of a trigonometric table.

". . . some historians go so far as to say that trigonometry was invented by him. The purpose of this table of chords was to give a method for solving triangles which avoided solving each triangle from first principles. He also introduced the division of a circle into 360 degrees into Greece" (Mactutor biography of Hipparchus, accessed 11-27-2008).