The most common astrology practiced in the West, and to a degree in Hindu astrology, has its origins from approximately the 2nd Century B.C.E. with the development of what we call Hellenistic astrology. You can also trace natal astrology's development from the first record we have of a natal chart around 415 B.C.E.  And if you are exploring the origins of the basic symbolism of Western astrology, you can stretch your studies to the stone momuments of Europe, like Stonehenge, that marked important celestial events through to the divinitory analysis of the Egyptians and the different cultures of Mesopotamia that linked celestial events with the fate of the king or kingdom. If we broaden our view still further, archeological evidence of human societies making a meaningful connection between the sky and man reach back 350,000 to 250,000 years.