This is a translation and explication of chapters three, four and five of the Huaunanzi, those most particularly central to the Huang-Lao Daoist cosmology of the early Han Dynasty. The Huainanzi is strongly related to the Daoism of Laozi and Zhuanzi but also incorporates a blending of astronomy, astrology, natural philosophy and Legalism making it a repository of themes seen throughout Chinese thought. In the author's words, "Chapters 3,4, and 5 of the Huainanzi, in addition to their intrinsic interest, are of importance to the intellectual history of Han China by making clear that yin-yang/five phase cosmology was fundamental to, and wholly integrated with, Huang-Lao philosophy in its fully developed state in the early Han." Chapter Three is an inclusive explication of the origins and nature of the universe, calendric systems, astronomy and astrology, yin-yang and the seasons, the calculations of portents, the full panolply of Han-era natural and correlational sciences. Chapter Four is The Treatise on Topography which attempts a comprehensive description of the world and its living beings based on the then-present literature. It shows how yin-yang and the five phases were understood to explain all phenomena. Chapter Five is the Treatise on The Seasonal Rules. It describes the astronomical, stem-branch and five phase correlations and the appropriate behaviors these portend. "Heavan and Earth in Early Han Thought" is fully annotated and contains tables and diagrams to explain the various principles. There is a full bibliograpy and index.