Thales of Miletus

https://en.wikipedia.org/wiki/Thales_of_Miletus

Thales of Miletus (/ˈθeɪliːz/; Greek: Θαλῆς (ὁ Μῑλήσιος), Thalēs; c. 624 – c. 546 BC) was a pre-Socratic Greek/Phonecian philosopher, mathematician and astronomer from Miletus in Asia Minor (present-day Milet in Turkey). He was one of the Seven Sages of Greece. Many, most notably Aristotle, regard him as the first philosopher in the Greek tradition, and he is otherwise historically recognised as the first individual in Western civilisation known to have entertained and engaged in scientific philosophy.

Thales is recognized for breaking from understanding the world and universe by mythological explanations to instead finding explanations for the existence of natural things and phenomena by theories and hypothesis, i.e. science. Almost all of the other Pre-Socratic philosophers proceed after him to provide explanations of natural things by way of there being a unity of everything because of the existence of a single ultimate substance, instead of explanation given by mythology. Aristotle reported Thales's hypothesis that the originating principle of nature and the nature of matter was a single material substance: water.

In mathematics, Thales used geometry to calculate the heights of pyramids and the distance of ships from the shore. He is the first known individual to use deductive reasoning applied to geometry, by deriving four corollaries to Thales' theorem. He is the first known individual to whom a mathematical discovery has been attributed.