Hegel's natural philosophy is an integral part of his objective idealist philosophical system, is his encyclopedic narration of all the achievements in the natural sciences attained up to the early years of the nineteenth century. Only after a long process of distillation did he tie together his philosophy of thought and of natural science to establish his rich and comprehensive natural philosophy. His On the Orbits of the Planets , written to secure his teaching credentials for the University of Jena, (...) marked the opening phase in the process of the formation of his philosophical thought on nature. Hegel's Philosophical Manuscripts written at the University of Jena and his Philosophy Primer compiled at the Gymnasium in Nuremberg represent his important transitional middle period. Part II of the Encyclopedia of Philosophy , from his lectures at the University of Heidelberg, was his already distilled and mature Natural Philosophy. (shrink)