from Miletos who lived during the first half of the 6th century BC.
Anaximander was probably a disciple of Thales, and he belonged to the Ionian school of nature philosopher. He stated that everything originates from the "indefinable" (to apeiron). All the elements and their attributes are in constant motion, and are either wet or dry, cold or warm etc. In this movement and the opposite forces Earth was created, as well as the heavenly bodies. He pictured Earth as a cylindrical shape that hovers in the centre of the spherical universe.
He was also an inventor, and is said to have drawn the first world map, as well as having created a kind of sun dial.