2G± 
HINTS TO TRAVELLERS. 
Observations for Bearings. 
To find the True Bearing of a 'peak or any other object by means of its 
observed angular distance from the sun. 
Observe the sun’s altitude,, then the angles between the object and the 
nearer and farther limbs, and lastly the sun’s altitude again; noting the 
times of each contact. If the object has any altitude observe it, and note 
whether it is east or west of the sun. Half the sum of the times of the 
observed angular distances is the mean time of the observation, and 
half the sum of the angles observed is the apparent angle; but if the 
farther limb, only, be observed, the apparent angle is found by sub¬ 
tracting the sun’s semi-diameter; or if the nearer limb, by adding. 
From the observed altitudes of the sun, the altitude at the time of the 
observed angle is found by Simple Proportion. 
With time at place find Greenwich date, either by the error and rate of 
the watch, or with the longitude in time. 
Take the declination from the ‘ Nautical Almanac ’ (if App. time is 
used. Page I.; if Mean time. Page II.) ; correct this for the Greenwich 
date. From the observed altitude, find the True Alt . 
[ True Altitude, 
Add together j Latitude , 
(. Polar Distance; 
divide their sum by 2 for the half sum, and take the difference between 
the polar distance and the half sum, which call remainder. 
I Log secant of the Altitude, \ 
. ,, , Log secant of the Latitude. I rejecting 30 from 
Add together £gg ^ o/ , mm> t he index. 
[ Log cosine of remainder, ) 
Take out the log sine square of the sum of these four logs (table 69, 
p^per), or divide thq sum by 2, cpid it will give thp log sipe of half tho 
