R S Corpora ttqudia, vel R corpus majus , S corpus rnwvs. 
a Centrum Gravitatis five anfa Librae* Z fumma velocitatum utriufyue cer2 
ports. 
^f^veloc. corp^f^ante impulfum (r* {r J^J^^ 
[ Z$p /j/Arf*/ ( quamvis disjunBas ) Re SeoRoS vel RoSoeScR in 
L'mea cujSffliht Cafus, & harum cju* fcribitur in Schemate more Hebraico, 
ea indicat motum contrariummotui , quern not at cujufvi* fyl/aba fcriptio Lati- 
na; SjlUba ccnjuntlaquietem Corporis denotat. ] 
1CU1US R+S:R::Z:S^ |2S^+ Se =oS \2Ra + Ro =eR, 
.Natura cbfervat regul is Additionis & Subduttioms Speciofae. 
An Account of two Books. 
' t HISTORIA C^LESTIS 5 Ex Libris & Com- 
mentariis M.Stis. Obfervationum Vicennalium T Y- 
CHONIS BKAHE, Dani , Augufta? Vindelic. 
An. 1666 , in Folio. 
THefe Obfervations of the Noble Tycbo > as they were pro. 
cured andpreferv'd bythofe Three Mighty Emperours, 
RUDOLPH. II. FERDINAND. II. and III ^ fo 
they were lately by the Command of his Imperial Majefty L E- 
O FOLD made publick. They are uiher'J in by a Liber Pro- 
logomenoS) compendioufly representing the Obfervations made 
from the time oi the very Infancy of Aftronomy unta that of 
its Refhuration by the Iiluftrious Tjcho\ and reduced into 7« 
Claffcs, %iz, 
1. The Babylonian Obfervations 5 from A. before Chrift 721. 
unto A. 432. 
2. The Grecian | from A. before Chrift 432. unto th: be- 
ginning of the Vulgar Chriftian Account. 
3. The Alexandrian^ from A. Chrifti 1. until A, 8*7. 
4. The Syro-Perftan-? from A. C. 827. unto 1457* 
5. The Norimbergian 5 from A.C 1457. unto 1505*. 
& The 
