Page:Philosophical Transactions - Volume 003.djvu/248

 R S Corpora æqualia, vel R  corpus majus, S corpus minus.

a Centrum Gravitatis sive ansa Libræ. Z summa velocitatum utriusque corporis.

Natura observat regulus Additionis & Subductionis Speciosæ.

Hese Observations of the Nobie Tycho, as they were procured and preserv'd by those Three Mighty Emperours,    and  ; so they were lately by the Command of his Imperial Majesty   made publick. They are usher'd in by a Liber Prologomenos, compendiously representing the Observations made from the time of the very Infancy of Astronomy unto that of its Restauration by the Illustrious Tycho, and reduced into 7. Classes, viz.

1. The Babylonian Observations; from A. before Christ 721, unto A. 432.

2. The Grecian; from A. before Christ 432, unto the beginning of the Vulgar Christian Account.

3. The Alexandrian; from A. Christi 1. until A. 827.

4. The Syro-Persian; from A. C. 827. unto 1457.

5. The Norimbergian; from A. C. 1457. unto 1509. Rh