Survey of Northeast Greenland. 121 
1'/m to 2m before the clock time of the transit computed for the 
object, which appears first, the level of the axis is read off and 
reversed. 1” at the latest before the time calculated the observer 
has to be ready at the ocular pointing the object by means of the 
slow moving screw of the vertical circle. The transit is observed; 
the level is read off; the clamp of the vertical circle is loosened; the 
telescope is placed at the zenith distance of the next object, and the 
observation of the latter is carried out in exactly the same manner 
as in the case of the first object. After the last reading of the level 
the universal instrument is reversed, the horizontal circle is placed 
оп M.P.+ax and set II is performed quite analogously with set I. 
Determinations for time before and after the observation are 
necessary., 
As an example of the determination of longitude by means 
of the moon azimuth I shall quote in detail the observation of 
25/1X 1907. 
Preliminary computation: 
I, — + 1815; ф = 76°46'.3; du — about + 1°19™.6. 
Grw. culmination of limb Il. 
a Var. 1h Long. д Var. 1h Long. 
Zoli (CUT Lower): :... 3h08m09s 129s = 12°59.6 618” 
aura 3 25 46 12 37.2 = 59” 
— pper) 4.2 3 33 53 129 14 50.4 HEAR 
TONNES 3 59 44 130 16 36.0 496 1108 
ь„. oo +63" I ae LADERE S ae 
a ( Grw. 3h33m53s EM Grw.an.. 14°50'.4 
var. 1295.14 = + 2 41 var. 566: 114 .. +116 
Be PRES 3h36m34s DRE eee 15°02’-0 
Oe A ASIEN 61 44.3 
Paralax cc 22 50 
le as 62934'; р дж = = x = 64°09'.1 
Е d, rn 10m.8 tx = Jed, + 3m = 8m4 = 2°06 
а 8.4 log sin t * 8.5640 
ope as oe te он 3h25.8 — cos д * 9.9894 
1. ж observ., sidereal time. 3 17.4 — cosec 2% 0.0458 
Е... +1 19.6 log sin а * 8.5992 
1. ж observ.. ‘57203. ....... 1h57m.8 а* —=а © = + 2°16.7 
от: + 10.8 М. Р. 31 45.6 
‘izontal ( 29°28’.9 
1. © observ., 57203........ 2808.6 ons 
readings | 34°02.3 
In set II the observation of the star follows 2 (12 а, + 3") = 167,8 
upon the observation in set I viz. by clock time 2h14%.6. In the case 
of the moon there may often be occasion to compute the moment 
