ICS 
HINTS TO TRAVELLERS. 
H, M. S, 
Error of watch at Eandar Abas at 4.10 p.m., May 16th .. .. .. 1 9 52 fast. 
5 days’mean rate. .. .. .. .. ~ 30-3 losing. 
Error of watch at Bandar Abas at 3 • jo p.m., May 21st. 1 9 21-7 
,, ,, Eorg at 3.30 p.m., May 21st.1 15 2 
Meridian distance or diff. of long, between Bandar Abas and Forg o 5 40 3 = 1 25 4*5 
As watch is more fast at Forg than at Bandar Abas, Forg is West of Bandar Abas. 
o r n 
. Longitude of Bandar Abas .56 iB co E. 
Meridian distance West .. .. .. .. 1 25 4-5 W. 
Longitude of Forg .=5 54 52 55 5 E. 
This method can be used at any part of a journey to measure the 
differences of longitude between two places. If the longitude of one 
of the places has been fixed by any of the absolute methods, the longi¬ 
tude of the other is known at once. If not, the longitude of either of 
the places may be fixed hereafter, and the longitudes of the places whose 
meridian distances have been measured will be in connection with it, and 
not be scattered about with large individual errors, as would be the case 
were they determined separately by one or two observations. 
Longitude by the Occultation of a Star. 
This is the best of the absolute methods of finding longitude, when 
a sextant or theodolite is available for ascertaining the local time. The 
following describes the manner in which the observation is taken:—- 
The moon in its monthly revolutions round the earth frequently passes 
between the earth and a fixed star so as to intercept a spectator’s view 
of the latter; the disappearance of a star from this cause is called an 
immersion , and its reappearance from behind the moon is called an 
emersion. A list of these phenomena is given in the 4 Nautical Almanac/ 
with the limits in latitude beyond which a star cannot be occulted by 
the moon. As the elements refer to the moon and star, as they would be 
seen from the earth’s centre, they serve equally for all places on the 
earth’s surface. 
Should the explorer’s position in latitude be ceniral as regards the 
limits given in the 4 Nautical Almanac,’ he will probably be able to observe 
the occqibation, bpt if by no means follows, because* his latitude is included 
