It's impossible to pinpoint one single person who "first" studied the movement of stars. Humanity has been observing the night sky and noticing the patterns of stars for millennia.

Here's a breakdown of key figures and their contributions:

* Ancient civilizations: The ancient Babylonians, Egyptians, Chinese, and others meticulously tracked the movements of stars and planets for thousands of years. They used these observations for calendars, navigation, and religious rituals.

* Early Greek astronomers: Around the 6th century BC, Greek philosophers like Thales of Miletus began to develop more scientific explanations for the movements of celestial bodies.

* Ptolemy: In the 2nd century AD, Ptolemy published his groundbreaking work "Almagest," which summarized the astronomical knowledge of his time. He proposed a geocentric model (Earth-centered) of the universe, which dominated astronomical thinking for centuries.

* Nicolaus Copernicus: In the 16th century, Copernicus challenged the geocentric model with his heliocentric theory (Sun-centered). This revolutionized our understanding of the solar system and how stars move.

So, while specific individuals made significant contributions to our understanding of stellar movement, the study of stars is a long and continuous process that spans thousands of years and involves countless people from various civilizations.