Vol. Il, No. 9.] Latitude of the Presdcy. College Observatory. 383 
[N.S.] 
50. Note on the hae of the Presidency College Astronomical 
Observatory.— HANINDRALAL Ganoutt, M.A., Presidency 
a Astronomical Observatory. Communicated by C. LITTLE, 
The latitude of our ae ee has been found by Talcott’s 
method to be 22° 34’ 312 N. While I was engaged in determin- 
ing the azimuth constants ot the clock stars, it spree 
occurred to me that 5; and +2 would respectively represent t 
values of the sine and cosine of our latitude with suffici ve 
approximation 
If ¢ be the latitude, de, ¢=22° 34’ 31/2, then sin 9= 
3838979 and cos ¢="9233756. satre ‘3838979 into a continn- 
i Dae Ae OF 
0 1 1 2 3 Bio 8, 
if) 3° 3. ate. 
1 
Similarly we get 9233756 = 7 oo 
and the successive convergents are 
It is evident that 5; and +4 are respectively the sixth and third 
convergent of the contin ued ions. 8; is in excess of the 
value of te Ms by 0007175 and 42 is in defect of the value of cos ¢ 
by °00029: 
In fa ot Ys and 12 are the sine and cosine of 22°37’ 11'"5, z.e., 
of the latitude of a place which is 2’40’"3 (arc) or 3°1 miles n orth 
of our observa snd ind These values ;5; and 13 serve all our nae 
purposes an ery convenient in all the numerical computa- 
tions in which the latitude of our observatory is involved. 
