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De Revolutionibus Orbium Coelestium, Book 1, Chapter X |
1512 |
Copernicus begins his cycle of observations of the planets with Mars. |
1514-1515 |
Starts writing Book I |
1515-1516 |
Observation of the Suns path, resulting in the discovery that the diurnal point of the Suns course had moved over 30 degrees since the time of Ptolemy; Copernicusaim is to establish the magnitude of the precession and the corresponding length of the sidereal year. |
1515 |
Discovery that the Suns eccentric is variable and that is apogee is moveable. |
1516 |
Discovery of the mobility of the Earths apsides and of certain changes in the eccentric of its path. |
1519-1520 |
Final editing of Book I. |
1523 |
Completes Book II. |
1524 |
Completes research work on the theory of the Moon. |
1524-1525 |
Begins work on Book III. |
1525-1526 |
Works on theory of precession (Chapters 1-14, Book III). |
1527 |
Determines eccentric variability and apsidal motion for Saturn. |
1529 |
Determines eccentric variability and apsidal motion for Jupiter. |
1530 |
Completes writing Books IV-VI. |
1532 |
Determines of eccentric variability and apsidal motion for Venus. |
1533 |
Copernicus opinions presented in the manuscript of his Cook given to Pope Clement VII. |
1536 |
1536 Tiedeman Giese writes a treatise to defend Copernicus theory. |
1539 |
Martin Luther expresses his opinion of Copernicus:This fool wants to turn the entire science of astronomy upside down! But, as the Bible tells us, Joshua told the Sun, not the Earth, to stop in its path! Georg Joachim von Lauchen (Rheticus), arrives at Frombork and begins his work with Copernicus to prepare the manuscript of De Revolutionibus for publication; Chapters 1-13 added to Book II, the final chapters to Book V, and Chapters 5-9 to Book VI. |
1540 |
Makes second calculation of the period of the sidereal year. Narratio Prima (The First Account), by Georgius Joachimus Rheticus (Retyk), propagating Copernicus theories, published in Gdansk. |
1541 |
Andreas Osiander, a Nuremberg theologian, advises Copernicus to describe his discovery in the prologue to his work as a hypothesis, thereby toning down its initial impact. |
1542 |
The first two folios of De Revolutionibus come off the press at Nuremberg. |
1543 |
De Revolutionibus Orbium Coelestium is published in Nuremberg. |