C 454 ^ 
Thus you will find the Latitude, and Time of 
each Obfervation from Midnight. In this Cafe the 
Beam-compafs muft extend to more than 90 De- 
grees. 
Cafe 4. If the Obfervations are more than a 
Day afunder ; as for Inftance a Day and two 
Hours (26 Hours :) Place the Centre of the Beam- 
compafs two Hours farther than it was the Day be- 
fore; but in different Declinations, according to the 
Table of Declination for the feveral Days. 
Cafe 5. When .the Obfervations are made by a 
Star : The Center of theEeam-connpafs muft be fet 
to the Declination of the Star then proceed as be- 
fore. To find the Hour in this Cafe, the right Af- 
cenfion muft be likewife given. 
Scholium . The fame Method may be ufeful at 
Land, when no Meridian Obfervation offers. 
II. The Ship in Motion. 
Cafe 1. Suppofe the Sun in the Equator : TheDi- 
ftance between the two Obfervations eight Hours,as 
before, and the Arch aaa(Ex.r) defcrib’d by the Ze- 
nith Diftance of the firft Obfervation, from the Center 
C ; and the Angle cab, 40 Degrees, is the Angle be- 
tween the Ship’s way, and the Azimuth of the Sun 
continued, ( given by the Azimuth Compafs ;) and 
that during the eight Hours, the Ship has made one 
Degree, or 60 Minutes from a to b, or from the Sun ; 
