( 5II9 ) 
this Obfer vation I intend to write a fimll Traca^ when I 
(hall gain leifure 5 in which I fliall demonftrate both the 
Diameter and Diftances of all the Planets by Obfervations; 
for which I am now pretty well fitted. 
Having obfervM the Diftances and Pofitioos of the 5 
Stara 3 by which <? made his tranp^ I fitid, that Tycho errs 
5 minutes at leaft both in the Places and Latitudes of them 
compared one with another. And certainly he errs as much 
in many others ; fo that the labour of Monfieur Hevelim to 
refilify their places is very needful. Not that I find fault with 
T^iE^flj 'tisa wonder^ ( confidering how difficult it is to fee 
plain Sights to a (mall Star) that ever he performed fo much 
and fo well: But if M. Bevelim ufe not Glaffes in their 
roomjl fear, we fliall but be where we were 5 and yet with- 
out this Reftitution we cannot expert any thing certain^ 
muchiefs accurate^ in Aftronomy. 
