What were some of the accomplishments of Chaldean astronomers?

They recorded their observations of the stars and made maps showing the position of the planets and the phases of the moon. The Babylonians also believed in astrology, the belief that the placement of the stars influences a person’s life. The Chaldeans, adding to the work of earlier civilizations, contributed to the science of astronomy. In fact, they built Ziggourats which were huge tours with many steps.