Survey of Northest Greenland. 263 
Azimuth table”). 
Om | 4m | gm | 12m | 16m | 20m | 24m | 28m | 32m | 36m 
t | | | | Е | 
а 
08008 | 0° | 242 | 543 | 719 | 844 | 940 | 019 | 086 | 143 | 194 
Ob40m | 10° | 240 | 281 | 318 | 352 | 384 | 413 | 440 | 466 | 490 | 513 
1h20m 20° | 534 | 554 | 574 | 592 | 609 | 626 | 642 | 657 | 672 | 686 
2h00m 309 | 699 | 712 | 724 | 136 | 748 | 758 | 769 | 779 | 789 | 799 
2h40m 40° | 808 | 817 | 826 | 842 | 849 | 857 | 864 | 871 | 878 
3h20m 50° | 884 | 890 | 897 | 902 | 908 | 913 | 919 | 923 | 928 | 933 
4h00m 60° | 937 | 942 | 946 | 950 | 954 | 957: | 961 | 964 | 967 | 970 
4h40m WO? 17973 | 316: |978: | 981. 1985129850 |7 987° | 9897 | 990717992 
5h20m 805] 9955 7395 11996 1997. 9980 9991} 99909991 9995939 
Q0 
QW 
R 
: sin { cos 0 sin t sin (90 — 0) 
Formula: sina = = - - —— 
cos В; sin z 
Example 2 —= 223202756 — 10% 2 — Ab” МУ 
IT PRE 789 
log sin (90 + 9).. 993 
log cosec z ...... 151 
SEP 
а = N59 W 
Determinations of latitude. 
When commencing the observations at a station, one lacks, as 
a rule, a more accurate knowledge both of latitude and of time. 
It must therefore be possible to compute the determinations of 
latitude without a knowledge of the time, as also the determinations 
of time must, to as great an extent as possible, be made independent 
of an accurate knowledge of the latitude. 
As a matter of principle the latitude ought therefore to be taken 
in the meridian; the hour of noon is of course preferable, out of 
regard to the smaller zenith distance and resulting smaller uncertainty 
of the refraction, but midnight can also be used. If, by a mere ex- 
ception, one is forced to attempt a latitude outside the meridian, 
the observation must be supported by means of a determination of 
time near the prime vertical and taken from the same station; other- 
wise one would generally lack the knowledge of the time which is 
necessary in order to be able to compute the latitude. 
In case the determination of latitude is to take place without 
friction, the knowledge of the clock time of the culmination within 
1) The table which is a table of log sin from degree to degree is an imitation of 
an English table of azimuth. The omitted characteristic is 9, exeept in the five 
underlined logarithms, where it is 8. 
