0 
vil 
and tlie result will be the hour angle E. of meridian ; should the remainder he more than 
24 hours reject 24 hours, and the result will be the hour angle W. of meridian. 
From apparent time being the time kept at sea the first rule will be found the most 
simple in practice. The above rules for a star will also apply to the determination of the 
hour angle of the moon or planets. 
With reference to the note at the foot of each page of the Azimuth Tables, as the Sun in 
the forenoon or a.m. is east of the meridian, and in the afternoon or p.m. west of the 
meridian, in applying the note to denote the bearing of a star substitute E. of meridian 
for a.m. and W. of meridian for p.m. 
N.B.—In taking from the Tables the azimuth or bearing of the star the hour angle of 
the star must always be taken from the right hand column of the page, under apparent 
time p.m. 
Example .—On 3rd October 1894 a vessel in latitude 49° N., longitude 10° W., steering 
east, at 7h. 20m. p.m. apparent time observed the bearing of Arcturus by the azimuth or 
standard compass to be N. 62° 30' W. Required the deviation, the variation on the chart of 
magnetic curves being 23° W. 
Arcturus R.A. 
14h. 11m. 
Declination 
19° 46' N. 
Sun’s estimated R.A. - 
Apparent time - - - 
R.A. of meridian - 
Star’s R.A. - - - . . 
Star’s hour angle or distance from meridian 
h. 
m. 
12 
40 
7 
20 
20 
0 
14 
11 
5 
49 ’ 
By referring to the Azimuth Tables for latitude 49° (Declination —same name as 
Latitude) and 5h. 49m. in the right hand or p.m. column, under declination 20° is 78° 43' 
and, as the star is W. of meridian, must be read N. 78° 43' W. 
Star’s true bearing by tables - 
N. 78 
43 
W. 
„ bearing by compass 
N. 62 
30 
w. 
Total Error determined in ship - 
16 
13 
w. 
Variation from the chart with 
opposite name - 
21 
0 
E. 
Deviation, ship’s head East 
4 
47 
E.