Trigonometry

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

Introduction

Trigonometry is a branch of mathematics concerned with relationships between angles and side lengths of triangles. In particular, the trigonometric functions relate the angles of a right triangle to ratios of its side lengths. The field emerged in the Hellenistic world during the 3rd century BC from applications of geometry to astronomical studies.

History

Ancient Babylon

It all starts almost 4000 years ago in ancient Babylonia (/ˌbæbɪˈloʊniə/; Akkadian: 𒆳𒆍𒀭𒊏𒆠, māt Akkadī), an ancient Akkadian-speaking state and cultural area based on the city of Babylon in central-southern Mesopotamia (present-day Iraq and parts of Syria).

They used a sexagismal numerical system, a numeral system with zicty at its based. Although technically it originated with