the Latitude and Longitude of York. 417 
fufpe&ed, that I flatter myfelf, the particulars I am going to 
mention will not be thought fuperfluous. 
The rule I adopted is this: 
The increafe of the moon’s R.A. in 12 hours (or any given 
time) found by computation, is to 12 hours as the increafe of 
the moon’s R.A.. between two places, found by obfervation, is to- 
the difference of meridians. 
E X A M P L B. 
November 30, 1782. 
fr* y n 
13 12 57,62 meridian tran lit of the moon’s fecond limb 1 at Greenwich by. 
13 13 29,08 ditto of *.trz Jt clock* 
31,46 Difference of R.A* 
32 14 8,0c meridian tranfit of the moon’s fecond limb 1 
* ^ 1 at York by clock. 
13 14 30,13 ditto of a J J 
22,08 difference at York, 1 the clocks going nearly fidereal time 
31,46 difference at Greenwich, J no correction is. required. 
9,38 increafe of the moon’s apparent R.A, between Greenwich and 
York,, by obfervation, 
141 in feconds of a degree, ditto, ditto, ditto; 
The increafe of the moon’s R.A. for- 12 hours by computation is 2334O feconds*, 
and 12 hours reduced into feconds is *. 432OQ-; 
therefore, according to the rule Rated above, 
// net # tt 
23340 : 43200 :: 141 : difference of meridians z: 261 — 
Thefe eafy obfervation s and ftiort reduction are the whole of 
the bufinefs. Inftead of computing the moon’s R.A. for 12 
hours, I have conftantly taken it from the Nautical Almanacs, 
which give it fufficiently exadt, provided fome attention be paid 
to the increafe or decreafe of the moon’s motion. 
7 
Were 
