History of astronomy
Babylonian astronomers viewed the sky as a celestial sphere, far above the Earth.  This sphere had shiny stars on it.  Like earlier astronomers, they organized and named the star patterns as constellations. They took special interest in the seven bright stars that did not stay in any particular constellation.  These were the Star of the Day (Sun), the Star of the Night (Moon), and five planets.  The stars and planets seemed to wander around the celestial sphere, in an area now called the Zodiac. The ancient astronomers carefully recorded the movements they saw.