V* An acconm of ^ooks. L AjlronomU ^hyfic^ c^r* Gco^ 
metrics Ekmenta. AuFiore VaVide Gregorio^ M, D. 
AjlronomU TrofejJ^ore S/iVjli^rto ■ S. 5. OxontcQ^ 
ijoi.foU 
W Hat the World has hi herto wanted, the Learned Dr 
Gregory^ has fapplied it v/ith a compleat Syftem oi 
mi^ and Piiyfical Aftrononiy y and as the 1 aft Ages have 
been fugiciemly furnifhed by the Ancients, with the Elements 
oi Geometry^ fo without queftion the future will have re- 
courfe to this Book, for thofe of Phyfical and Geometrical 
Aftronomy.. 
The Phyfical explications are all built upon the principles 
of the great Mr Newtm ^ and he has, throughout the whcle 
Work, fp mixed thefe with the Ptenomcna's' thenafelves, 
that they who are only follicitous about the Aftronomical 
parr, may underftand it, as it is ther^ delivered, without in^ 
quiring intp the Phyfical eayfes^ ^ Tfie Geometrical parts axe 
either all proved irooi the citations, of ftandard Authors, jor 
demonttrated in X^^^/s, inferted in their refp^^di.ve places. 
And that the, Reader may not think Phyfical Inquifitions in 
Aftronomy to be only new, in his Preface he proves from 
Dhgems Ldcrtius^ Flufarch^ Stobei^y &c. that tiie ancient 
Philofophers, befides their knowledge of the true Syftem of 
the Univerfe, were not unacquainted with the real and Pfay^ 
Ileal caufes of the Planets Motions, and that univerfal Law 
of Nature from which they all fpring» viz, that-Matter at- 
trafts Matter in a reciprocal proportion of the fquare of the 
diftance. 
In the firft Book the Author treats of the Order, Motions 
rin4 Periods of the Priniary Planers^^ and the chief appearances , 
that arife from thence, ai thSrl31reftions, Stations, RetroV 
gradations, C'^c, the different phafts of the inferior, like to 
thofe 
