( «59 ) 
He takes Notice of five remarkable Spots in her 
whole Surface, the two fraalleft of which are placed, 
one near each Pole, the other three lie along the jEqua- 
tor, and cover good Part of a Zone, extended to about 
30 l^cg. of Latitude on each Side, He reprelents 
them to be much like the larger dark Spots in the 
Moon, which are ufually called Seas, but confiderably 
fainter, fo as not to be eafily difcernable even to a Iharp- 
fighted Obferver, without the Affiftance of a Tele- 
fcope, capable of reprefenting diftindlly the Planet 
under an Angle equal at leaf! to that under which 
the Moon appears to the naked Eye, and with an 
Aperture of 3 or 4 Inches of the Roman Palm He 
then proceeds to give the Defcription of a Machine 
contrived by him to reprefent to the Sight the Mo- 
tion of the Earth and Fenus in their Orbits, and by 
the M ;ans of a Lamp placed in the Center, to Ihew 
the Phafesof the Planet, and Appearance of the Curve 
Lines defcribed by, the Revolutions of the Spots 
found the Axis. ^ 
This Revolution he makes greatly different from 
thofe of the Earth Mars (the two Bodies next 
in order of the Planetary Syftem) both in the Pofiti- 
on of the Axis and Time of the Period. He places 
the Colums Soljiitmum,ox Plane, paflinv through the 
Axis of the Planet and Tropical Points‘’of its Orbit 
about the xoth Degree of Zetf'and Aquarius, and gives’ 
the Planes of its ^Equator and Ecliptick an Inclination 
I to each other of about yy Degrees. He determines the 
Tme of the Revolution to be about ^4Days and 8 Hours, 
I of z 3 Hours, as it has been generally taken to 
I be from fome Obfervations made by Mr. CMni in 
the 
