(6iiy 
An Acconipt of fome Books. 
I NicolaiMercatorls Holfati.eSoc. Rcgia, IMSmUTlOmM 
AStRONOMlCARUMLihri dm.de MOTU ASTRORUM 
Cmmni & Profrio, fecu^dum HTFOTHESES Veterum& 
Kecentiorum pr£cipu^i^ deq\ Hjpothefean ex Ohfervatis conflrw 
mone : cum TaBUUS TYCHOJSflA MS SolmbmXumnhm, 
Luffx-Solmlpud^C^ RUDOLPHINIS, Solis^Fixarum,(^ quif^q-^ 
Errantmm^e^irumq\ UJu^pr^eceptis exemplis commonJlrAto : ful' 
nexi Appendice eorum, qu£ noviffimu temporibm cdltm inrntm* 
runt. Loadini, 1676. in%o. 
T His Learned and fnduftrious Mathematician hath iimde it 
his bufinefs to coniprehend in thefe Infiitutiom the Sum 
and Subftance of Aftronomy : And al though many Authors before 
bim have done very worthily in treating of this Science, particu- 
larly M£filwf^,Kepleru4jRicciolo,z.v\A Gaffendmi yet hath He pur-^ 
fued feveral things differently from others,and /;?y?/?^^ on fuc par- 
ticulars,as he thought mgjl pertinent to his purpofe. For,befides 
the Reprefentation of the main Ufe of both the Globes in divers 
confidcrable Problems, and the Trigonometrical Calculation em* 
ployed in the doftrine of the Sphere 5 he hath with a peculiar dili- 
gence explained the matter of the Equation ef tme m both the 
Ptolom^An and CopernicmS'jhtm^ asalfotheL/^;?^r Hypothe» 
fis of tycho^md the Ellipttcd of the Planets : Nor hath he been lefs 
folicitous in teaching the way of railing Hypothefes from Obfcr- 
vAtiom.zTiA in delivering the calculus oi theCelefria! xMoiions from 
the moft'approv'd Tables : Explaining alfo w^ith a not ordinary 
exaftnefsthe Keflerkn Hypothefis of the Planecs,and fubjoyning 
thereto the Afironomical Hypothefesof [Kir/^, Euligaldus, and hps 
oyvn^ which laft he efteems New, and according to which he 
teaches how to make a calculus a priori^ comparing the fame with 
good Obf^rvations* The whole he concludes with the exhibition 
of thelate Difcoveriesmadeinthe Heavens. So that it ftems to be 
a, work very iifeful for all Students of Aftronomy, both laying the 
true foundation of this Science, and direfiing the Lovers thereof 
to thofe particulars^ that> may render them accomplifted in the 
fame. 
