( Si7) 
Tliis Inftrument may be made to fhew the hour with 
as much facihty^ as a Clock or Sian-dial, if the Horary 
Ring be made to move within a larger fixed one, and the 
outward Circle of the foteer divided into the days 
of the month, refped being had to the Right Afcenfion 
of the Sun and Star 5 then by bringing the 2 oppofite 
points in the fixed Circle to the Perpendicular, which is 
done at the fixing the Inftrument^ move the Circle till 
the day of the month come to any of thefe, and the 
Ring is redified for that day, and if the air be clear, you 
will fee the Star ftand at the true time of the day or 
night. 
It may be objeded^ that in few years by the Annual 
increafe of its declination, the PoIe-Star will by moving 
in a^effer Circle be brought too far from the edge of the 
Ring, that the exad hour and minute cannot well be 
diftinguifti'd 3 but this inconveniency,when it is one, may 
be eafily remedied feveral ways, either by making alefler 
Ring, or by extending a fine thread of Silk crofs the 
Ring, till it cuts the Star, and at the fame time it gives 
the hour, or, which will yet make this Inftrument com- 
modious for other purpofes, there may be made an In- 
dex to move on the Center of the Hour- wheel, which 
being brought to cut the Star with the edge that proceeds 
from the Genter,it will at the fame time cut the hounand 
now we need not be follicitous about the exad Diameter 
of the Ring,provided it do but a little exceed thediftance 
of the Pole-Star from the Pole, the focal length of the 
Glafs being made Radius. 
That moft Learned Accurate,and ]udicious Aftronomer 
Mr John FUmfieed, Mat. Reg. and F. R. S. has lately dif* 
covered, that there is a Paralaxis of the Earths Annual 
orbit at the Pole-Star of about 40 or 45 Seconds, where- 
by the Diameter of the Stars Parallel is greater in 
than in December by about i Min» 2 Seconds, which he 
has evinced from 7 years fucceffive obfervations, where- 
N n n n n a by 
