76 USE OF THE TABLES 
Problem 9.—The navigator of the U. 8. S. Raleigh, on January 11, 1928, in 
D. R. latitude 15° 08/6 N., longitude 157° 19/1 E., observes the sun at L. A. N. 
as follows: hs © 52° 39’; I. C. (+) 1’; height of eye, 41 feet. Required the latitude 
at L. A. N. 
Subtract the D. R. latitude from 90°___.__._..-_- 90° 00:6 
15 08.6 
(This equals 6, and takes the same name as the 
latitude.) 74. 51. 4 (N.) 
Apply the’ declination2-_.-. 2-55-22 ee 22 01.0 (S.) 
The result (d-+-b) equals. he ~~ -.25-=- 3-22. 52 50.4 
| eA A. Uh ee ape 52 49.4 
a equalss #88 1/0 (away.) 
4=180° since the observer’s back is toward the elevated pole. .*. the resulting 
latitude equals 15° 08/6+1/!0=15° 09'6 N. 
Problem 10.—The U.S. S. Los Angeles while making passage from Midway 
Islands to Shanghai was at L. A. N., on July 22, 1928, in D. R., position latitude 
28° 40’ N., 175° 14’ E. The navigator observed the sun for latitude as follows: 
h, © 82° 06’; I. C. (—) 1’; height of eye, 1,050 feet. Required the latitude at 
A. IN: 
90° 00’ 
Dh wate 2sc 400 sen. h; 82° 06’ 
—_—___——_ I. C. {5 
pe ee Gle820% IN: 
deckas. (202 2278 Ne 82° 05/ 
——_—_—_—- Corr. Tab. A. and B. —16/ 
| pe 81 42.8 
lie: 81 49.0 Miruesaltes.. 22. oe 81° 49’ 
(ee 6. 2 towards 4 180° 
Therefore latitude at L. A. N.=28° 40’ N.—6/2=28° 33/8 N. 
NOON CONSTANT 
If, to the value d+-b (or h,) we apply the index correction and the correction for 
height of eye for this h, with reversed signs, we thereby obtain a noon constant K. 
At L. A. N. simply observe the sun’s altitude and apply to K thus obtained to get 
the altitude difference. This method eliminates the necessity of finding an 
approximate altitude with which to find the height of eye correction. It also 
eliminates confusing signs. 
Problem 11.—In problem 9: 
Rit (jb) SCQMAISS . <a hee he pel Pn oe BRS 52° 50/4 
Reverse fons Ty Cute es see (—) 10 
Height of eye correction._...-------- (—) 9/4 
(2) Noonsconstantsa() == ae = ee 52° 40/0 
Steps aaya saul eb 0s (Se en SR he ae 52° 39/0 
a=1!0 (away) 180° 
