Planetary Motion (Science Foundations) by P. Andrew, Ph.d. Karam

Thousands of years ago, people looked at the sky in wonder, fascinated by the motions of a few wandering 'stars'. Nobody understood where these wandering objects - now named Mercury, Venus, Mars, Jupiter, and Saturn - came from, why they moved, or what drove their motions through the sky. Today, people know these objects are planets, but the quest to reach this understanding took thousands of years, and the consequences were profound.