1. P. Косн. 
р = 1211/06” = 4266”. 
ВО О оао | 051211] 2s 08192028 05241563 
Correction et. | +113 41 1 13 41 1 13 41 
Sidereal time ....... 125 53 | 1 32 43 1 38 37 
DS TS FA Hs oe 1 26 53 | 1 26 53 1 26 53 
Å fl = 10% | + 505% | + 11m44s 
Son le Inter richesses | = 021500” =I. 1°27'30" | AL 9956/00” 
Пора. 3.6800 3.6300 3.6300 
COS ee 0.0000 9:9999 9.9994 
si | к 
N eens 3.6300 3.6299 3.6294 
Read zus rer 11259 ate 11253 69% 11°54’06” 
ИО N Nes == 28 + 27 |—+ 27 
Refraction mee | — 13 + EE 15 
HP OR TERRE | 780618” | . 78°06'15” | 78°06'08" 
ро | + 11106 |- 11105 |+ 1 1100 
Loin | | 
or sin?ttanh.. | | 0 |—+ 1 
АН FE DE | 76955712" 76955'10” | 76°55’09” 
Аз a mean we get p = 76°55’10” with a mean error of a couple 
of seconds. 
Determinations of time. 
Determinations of time are the most difficult astronomical ob- 
servations in high latitudes, particularly under conditions where the 
latitude is not accurately known. The influence of an error of the 
latitude appears from a differentiation of 
sin z + sin g sin д 
COS @ COS 0 
co , Which gives: 
+ cos? p cos д sin à + (cos 2 + sin g sin д) sin g cos 9 
— sintdt = — ——— — —— = - dig: 
cos? @ cos? 0 
sin 0 + coszsin 
or at: = — ere 
cos 0 sint 
x sec? фаФф 
In 80° sec? p about 33 which very clearly indicates that even 
a slight uncertainty in the latitude, under certain circumstances, may 
produce a rather considerable uncertainty in the clock time. 
From 
1 = “<sinuzicos A 
sind + coszsing _ d 
cos @ — sin {cos ¢ cos д 2 sin { cospcosd 
dt 
d ф 
we see the well-known fact that the nearer to the prime vertical the 
determination of time is performed, the more independent it becomes 
of the latitude. 
