APPENDIX III 
339 
The corrections computed from this formula seem to be fairly well supported in the individual zones 
up to + 6o°. North of the Pulkowa zenith the observations do not seem to require this correction. 
(4) Dorpat 1815. The corrections for this Catalogue are applicable to a manuscript-catalogue 
compiled from Struve’s observations of 1814-15 (Part II, Volume I, of the Dorpat Observations). 
Essentially the compilation was effected as follows: 
Constant corrections were applied to the results for each night in 1815 on account of a revision 
of the places of the adopted fundamental stars. These, with adopted corrections, are: 
S S 
Capella +0.17 a Persei -f 0.21 
Vega +0.17 8 Cassiop. + 0.24 
a Cygni + 0.18 c Urs. Maj. + 0.18 
The mean constant correction might have been taken as -f o?i8 without serious loss of accuracy. 
In the observations are given, for each star, coefficients of correction to be required on account 
of any future revision of the star-constants adopted in the reductions. The present manuscript- 
catalogue was formed with adopted Aberration = 2o'.'5o and Nutation = 9''224, the formula being: 
— ?044 v + ®oi2 a , 
v and a having the signification given in the Observations. 
The results for 1814 require systematic correction to reduce them to conformity with the revised 
right-ascensions for 1815, as described in the foregoing. The adopted value of this correction is 
in the sense (1815-1814): 
+ o®i8 — ?o44 v + [ + ?oi9 + ^031 sin (268^5 + a)] sec 8 . 
The right-ascensions thus revised for the two years (half weight for 1814) constitute the manuscript- 
catalogue to which is applicable the corrections given in the table for Dpt. 15. 
(5) Bradley 1755. These corrections, A8 a , are mean values applicable respectively to stars 
south and north of the Greenwich zenith; their determination is liable to material uncertainty; and 
it is quite possible that they could be proved not constant in all zenith-distances. 
(6) Dorpat 30. “Correctiones Ultimas” of the “Positiones Mediae” must first be applied to 
the declinations. 
(7) The tabular values of systematic correction in declination for Edinb 40 are divided into two 
series. Corrections A 85 under Edinb 401 apply to Edinburgh observations until the end of 1840 
and under 40 2 to observations, 1841-1844; but the value of A8 a for the two periods is assumed 
to be the same. The difference in A 85 may be partly due to difference of computed refractions 
in the two periods. 
(8) Radcl 45. The Catalogue declinations should first receive corrections taken from p. viii 
of the Introduction. A similar correction is required for Radcl. 60. 
(9) Cordoba 1875. There are decided systematic differences in both coordinates between the 
results, Clamp E. and Clamp W.; also in declination between the results obtained in different posi¬ 
tions of the circle, the corrections in the table require additional special corrections for the separate 
years. (See Astr. Jour. (No. 550), Vol. XXIII.) 
Thus we have the following additional corrections, Aa$, for right-ascensions, Clamp E. For 
Clamp W. the opposite signs must be employed. 
CORRECTIONS, CLAMP EAST. 
8 
Corr. 
8 
Corr. 
0 
S 
0 
S 
0 
— .006 
-45 
+ .029 
- 5 
— .001 
5 ° 
+ .030 
10 
+ .004 
55 
+ .030 
IS 
+ .009 
60 
+ .030 
20 
+ .014 
6 5 
+ .030 
25 
+ .018 
70 
+ .030 
3 ° 
+ .023 
75 
+ •030 
35 
+ .027 
80 
+ .030 
-40 
+ .028 
-85 
+ .030 
