what was parts of the De revolutionibus orbium coelestium and what were they about?

Answer 1

De revolutionibus orbium coelestium (English: On the Revolutions of the Heavenly Spheres), first printed in 1543 in Nuremberg, is the seminal work on heliocentric theory and the masterpiece of the great astronomer Nicolaus Copernicus (1473-1543). The book offers an alternative model of the universe to the Ptolemaic system

The major work of Copernicus is the result of decades of labor. It rewrote Ptolemaic theory for a moving earth, and incorporates over a thousand years of accounts of astronomical observations of varying accuracy. In its standard English edition, it contains 330 folio pages, 100 pages of tables, and over 20,000 tabulated numbers.

The book is divided into six main parts (books):

The first part contains a general vision of the heliocentric theory, and a summarized exposition of his idea on the World.

The second part is mainly theoretical and describes the principles of spherical astronomy and a list of stars (as a basis for the arguments developed in the subsequent books).

The third part is mainly dedicated to the apparent movements of the Sun and to related phenomena.

The fourth part contains a similar description of the Moon and its orbital movements.

The fifth and the sixth parts contain the concrete exposition of the new system.

Answer 2

I have no idea what your question is, but here's the wiki entry about the subject.

This sounds like a poorly phrased homework question. If so, maybe look in your text book. ;P