206 
Mints to Tea Vellums. 
Example of Sextant Observation. 
rt . Cos apparent distance 
Cos difference of bearings = coSppMUf^. 
July 15th, 1899, p.m. at place, angles and altitudes taken with a sextant. 
Lat. 51° 24' N., Long. 0° 9' 35" W. Index error - 2' 10". 
Obsd. Alt. in Quicksilver. 
o in 
87 45 OO 
Time. 
H. M. S. 
3 1 3 18 
Obsd. Angular distance of anl 
object, East of the Sun ..J 109 0 
Year. Month. Day. 
H. M. s. 
Month. Day. 0 
1 
ft 
1899, July 15 .. . 
. 3 13 18 
Declination July 15th (Page ii.N.A.) 21 
Correction by Hourly Diff. for G.M.T. — 
32 
2-8 N, 
Error of Watch. 
Month. Day. 
. - 0 13 
1 
. 15*7 
G. M. T. July 15 
. 3 13 5 
21 
30 
47 'i N, 
0 / rt 
90 
00 
00 
Obsd. Alt. in Quicksilver © 87 45 00 
Index Error . .— 2 10 
North Polar Dist. .. .. .. — 68 
29 
12-9 
2)87 
42 
50 
Obsd. Alt. 
5 i 
25 
Refraction .. .. 
1 
0-9 
43 
50 
24-1 
Semidiameter .. 
.. .. + 
15 
45-6 
44 
6 
9*7 
Parallax .. .. 
+ 
5-9 
True Alt. 
.. .. 44 
6 
15-6 
O’s True Altitude 44 6 15*6 Sec. 0*143831 
Latitude.51 24 00 Sec. 0-204899 
N. Polar Distance .. 68 29 12-9 
2)163 59 28-5 
i Sum .. .. .. 81 59 44-2 Cos. 9*143804 
i Sum /-v N. P. Dist. 13 30 31*3 Cos. 9-987815 
O’s True Bearing Log. Sin. Square = 
S. 66° 42' W., 
9*480349 
Obsd. Alt. Q 
Semidiameter 
Apparent Alt. © 
4 3 5 i 25 
+ 15 45-6 
44 7 io-6 
Observed angular distance of object from the near limbi 
of the sun , corrected for Index error ./ 10 9 
O’s Semidiameter.. .. .. .. .. .. 4* 15 45-6 
Distance from ©’s centre .. .. *. 
©’s Apparent Altitude .. 
Difference of Bearings . 
= 109 
25 
45-6 
7 
io-6 
= 62 
23 
44 
*180 
CO 
00 
117 
36 
16 
Cos. . .. 9*521981 
Cos.9 856057 
Cos. 
= 9*665924 
True bearing of ©. 
Object E. of © 
S. 66 42 00 W. 
. 117 36 16 
True Bearing of Object.. =s S. 50 54 16 E. 
* If the obsib angular distance is greater than 90 °, subtract this difference of bearings from 180 °. 
