AIAX. 
A Catalogue of Standard Polar and Clock Stars, for the Reduction of Observations in 
Right Ascension ; with a Discussion of their Positions. 
By TRUMAN HENRY SAFFORD. 
( Communicated September 9, 1862.) 
Tur object of the present Catalogue * is to furnish (additional to the very accu- 
rate positions of the Berlin Jahrbuch) the means of reducing observations of right 
ascension with greater convenience and accuracy, and in a somewhat more systematic 
manner, than by the aid of former catalogues. It is divided primarily into two cata- 
logues, the one of * polar stars," the other of *clock-stars," so called; with a sup- 
plementary list of stars which for large instruments are not commonly used in either 
capacity, but merely as tests of the accuracy of observation and reduction. 
Excepting 25 * polar stars," all the stars here given are found either in the Nau- 
tical Almanac Catalogue, or in that of the Berlin Jahrbuch. | 
This Catalogue contains, then, in the first place, the 47 stars of whose apparent 
places an ephemeris is given in the Jahrbuch; 2 of these being “ polar stars,” 
36 “clock-stars,” and 9 of the supplementary list. 
In the second place, our Catalogue contains the 25 “ polar stars" — stars within 
10? of the north pole — mentioned above. 
In the third place, all the stars of the Nautical Almanac Catalogue are here given, 
except o Columbe and 9 Sculptoris, £ Urse Minoris, y Draconis, and y Cephei, and 
also the stars below 45° of south declination. 
The mean positions in this Catalogue of the 47 stars are derived from Wolfers's 
* The Catalogue was originally computed for the use of the Observatory of Harvard College, and has 
been applied since May, 1862, in the reduction of transits. It is published here with the approval of the 
Director. 
VOL. VIII. 10 
