( 832 ) 
ininution,of appearing and difappearing,doth not befall him up- 
on the account & by rcafon of the variation ofhis Diftancc from 
the Earth and from the Sun : For, befides that in one revolution 
of this Planet about 5"^;«^», he varies not the hundredth part of 
hisdiftance;his nnft fenfible diminution appears then, when be- 
ing in the upper part of his circle he defcend^ towards the low-- 
er part, approaching to the Sun and the Earch. 
Tis aifo certain,that this viciffitude doth not befall him from 
the different expofition of this Star to the Earth and to the Sun, 
as it comes to pafs in the increafe and decreafe of the Moon,for- 
afmuchas in this great dittance he is always expofed to the 
Earth and the Sun,as the Glqbe of Saturn himfelf, whom we al- 
v^'ays fee full of light ^ without a fenfible difference between the 
Oppofitions and the Quadratures. 
Bun itfeemsjthatoneparcof his furfaceis not fo capable of 
refleflingto usthe light of the Sun which maketh it vifible,as the 
other part is.Whence we may conj£6ure,that theGlobeof this 
Sate! lit hath fome diverfity of parts analogous to that of the 
earchjthe one part of whofe furface is cover'd by the Sea,which 
is not fo fit to refieft from all parts the light of the Sun, as the 
Continent which maketh up the other part : So that this Planet 
by a converfion about hisAxiSjOr by an expofition of the fame 
Hemifphere to Saturn(much after the manner of the Hemifphere 
of the Moon to the Earth,)fometimes turns to us the part analo- 
gous to theCoQtinenCjfomtiiBS that part which anfwers to theSea. 
This viciffitude of phafes in this Planet was the caufe, tbathc 
could not be found fince he was firft difcover'd in the year 1671, 
till the midft of Dec. 1672 ; after which time he difappeared 
once again until the beginning of Fek. 1673 ; at which time, ha- 
ving been obferv'd 13 days fucceffively, he afforded us the op- 
portunity of determining the period of his motion. 
Since that time , as often as Saturn hath been diftant enongh 
from the Sun to enable one to difcern this P]anet,hc hath always 
been feen in all his Occidental DigrefrJons,and in the Gonjunfli- 
ons withSatum,which have fince happen'd witha great latitude, 
as well in the upper part of his circle as in the lower, & he could 
never be feen in his Oriental digrelTionSjWhere he remains invifi- 
ble in every revolution of So days for a whole month together* 
He begins then to appear 2 or 3 days l^efore his conjunftion 
in the inferior part, and todifappear 2 or 3 days after his con- 
Jun&ion in the fuperior part. And fometimes after he hath begun 
CO difappear in a Telefcope of 32 foot, he hath been fought for 
wub a Telefcope of 45 foot^ but in vain. The 
