108 I. P. Косн. 
hour angle of the equatorial star. In Albrecht's collection of tables 
there are tables of this kind, but as they were only computed for 
latitudes as far as the 64th parallel, we had to make a special table 
for Danmarks Havn. 
The azimuth table was computed for every 10' of the hour angle 
by the formula; 
= [+ (90° + ö,) sin t + !/2 (90° + д.) sin 1’ tan ф sin 2 fJsec ф 
where д, was a roughly estimated and rounded off mean value, 
88° 49’ 00”, for the declination of Polaris in the years 1906—07. The 
table indicated A in tenths of a minute. 
As the azimuth corresponding to the declination д” is 
Le 0 
0° д. 
we further made a small table for every 10” for the factor Er 
(3 decimals). For the hour angle of the equatorial star one has 
approximately 
An — Ад 
в =. 4 80 (g + à) 
cos д 
sin ( +0) 
The table of the factor 4 = 
for every whole degree of the ahnen from 0° to 40°. In case 
such a table is to be used for the abbreviated method for calculation 
of observations for time mentioned on pp. 116—117 it ought, how- 
ever, to be computed to three decimals. 
The hour angle being known, the zenith distance of Polaris 
could be estimated with great certainty, and consequently a special 
table of this (Albrecht table 5) was not necessary. Neither had we 
any use for ihe table of the zenith distance of the equatorial star; 
the value corresponding to the meridian being sufficient. However, 
as it turned out to be practical to make out from the star catalogue 
a special list of equatorial stars with a northern declination from 
0°—40° (magnitude and right ascension), z = @—+0 was naturally 
put down instead of à. 
As an example I willgo through the two determinations for time 
made on 24/IX 1907. Out of the above mentioned list of equatorial 
stars of a northern declination from 0°—40° the following two groups 
were selected: 
was computed to two decimals 
Star Mag. | a | | Star Mag. a | z 
7 Pegasi | 31 | 22n38m38s | 47°03" | В Arietis | 27 | 1n49m29s | 56925' 
и Pegasi 3.7 | 2245 30 | 52 40 | a Arietis | 22 | 20155 | 53 45 
y Piscium | 38 | 23 12 20 | 7400 | Ясен | 45 | 208 03 | 68 22 
x Piscium | 5.0 | 23 22 09 | 7602 | ÆCeti | 43 | 22312 | 68 44 
