312 Latitude and Longitude of Yale College Observatary. 
EDINBURGH AND NEW HAVEN. 
Date. Observed increase of AR of|\Computed Difference of Meridi- 
1835. oon’s first limb. ans. - 
m. 8. h. m. 8. 
June 8 11 49.96 4° 38 69 
July 6 11 53.68 40 
The longitude of Cambridge is taken at — 23.54s.; and that 
of Edinburgh at + 12m.°43.6s.; and the mean of the preceding 
ten observations gives the longitude of New Haven from Green- 
wich 4h. 51m. 37.7s. Mean difference, + 8.4s. 
In addition to these observations, on the 9th of August, 1835, 
two occultations were observed, viz. of t* and t? Aquarii. The 
immersion of the former occurred at 19h. 13m. 51.5s. sidereal 
time; that of the latter, at 20h. 57m. 12.5s. I failed to note the 
emersions with sufficient accuracy to be of any use. 'To derive 
any valuable result from these observations, we need to know the 
true places of the moon and the above stars. From observations 
made at Greenwich, and published in Vol. rx. of the Memoirs of 
the Royal Astronomical Society, it appears that 1.11s. should be 
subtracted from the moon’s right ascension, as given in the Nat- 
tical Almanac for August 9th. How great may be the error of 
the moon’s declination as given by the tables, I have no satisfae- 
tory means of determining. From the observations of Prof. Hen- 
derson, however, (Mem. Ast. Soc. Vol. 1x. p. 273.) it may be 
presumed that this error is well nigh insensible. The places of 
both of the stars are taken as they are given in the Nautical Al 
manac, and from observations at Greenwich, it appears that the 
right ascension of the latter at least was very correctly computed. 
The longitude resulting from the observation of t' Aquarii, is 4h. 
52m. 17s., and from t? Aquarii, 4h. 51m. 58s. The first of these 
differs 39s. from the mean of my former determinations, which 
would seem to indicate either that the star’s place was somewhat 
different from what it was assumed, or that the observation was 4 
poor one. Finally, the longitude deduced from the eclipse of 
1811, according to the computation of Dr. Bowditch, is 4h. 51m. 
51s. Bringing then together the results of all the different ob- 
servations, we have: : 
June 7, 1835, Greenwich observation, 4h. 51m. 33s. W. long- 
_“ . Cambridge 8 : 26 
