[ ij6 ] 
Horizon without fetting, and as long below it in Win* 
ter without rifing. While he is more than 15 De- 
grees from the Equator, he neither fets to the Inha- 
bitants of the neareft Tropic, nop fets to thofe of the 
other 5 whereas, at our terreftrial Tropics, he rifes and 
fets every Day in the Year. But to let us know more 
particularly the Phenomena of Venus s Tropics, we 
will fuppofe the Inhabitant, who has feen the above- 
mention’d Appearances at the North Pole, to have 
travell’d thence along the firft Meridian 15 Degrees 
to the Northern Tropic, carrying his Engine or In-, 
firument along with him 5 and to have fet it due 
North and South, in the Place where the faid Meri- 
dian interfefts the Tropic $ and as the Meridian of 
every Place is in a great Circle palling thro’ the Zenith 
of the Place and both Poles, he can now be at no 
Lofs how to fettle his Meridian, and obferve as well 
the Amplitude and Azimuth, as the Altitude of the 
Sun j who will rife to him 10 Degrees North of the 
Eaft, with about one Degree of North Declination : 
And going on 100 Degrees (to be meafured on the 
horizontal Plane,) he will crofs the Meridian with 
Degrees of North Declination, and 27* of Alti- 
tude s then, making an intire Revolution without 
fetting, he will crofs the Meridian at 48- Degrees of 
Declination, and 63*- of Altitude: At the End of the 
next Revolution, he will crofs the Meridian in the 
Zenith at the greateft Declinations namely, 75 De- 
grees s and thence he defeends in the like Spiral, 
eroffing the Meridian at the fame Altitudes as above, 
til), in his fifth Revolution, he fets 10 Degrees North 
of the Weft, 
1 2. 
