126 



ASTRONOMY FOR 1889, 1890. 



decided uixm several changes liave been iniide in the original jiro- 

 gran)nie, the work being eventually divided up among the following 

 observatories : 



35" to ?.0° Leyden. 

 30 to 25 Cambridge (Eng.) 

 25 to 15 Berlin. 

 15 to 5 Leipzig. 

 .") to 1 Albany. 

 + 1 to -2 Nicolaief. 



80'-' to 75^ Kazan. 



75 to 70 Dorpat. 



70 to G5 Clnistiania. 



(55 to 55 Helsingfors-Gotlia. 



55 to 50 Cambridge (U.S.). 



50 to 40 Bonn. 



40 to 35 Lund. 



The work of observation is now finished. Sonio of the zones have 

 been published (Kazan, Christiania, Helsingfors, Lund), others are iu 

 press, and the catalogues have been begun. Three of the catalogues 

 (Albany, Helsingfors-Gotlia, and Christiania,) have just appeared. 

 Meanwhile the zones have been extended to the southern sky, the fol- 

 lowing being to a greater or less extent under way : 



—yo to — O'^ Strasbnrg. —14^ to— 18° Wasliington. 



—6 to — 10 Vienna. —18 to— 23 Algiers. 



-10 to — 14 Cambridge (U. S. ). 



The positions of the 303 fundamental southern stars are furnished 

 by observations undertaken at the Cape of Good Hope, Madison, 

 Annapolis, (Karlsruhe, Leiden, and Strasbnrg. Gould's southern zones 

 extend from —23^ to— •SOC', and it is to be hoped that before long we 

 shall have a catalogue embracing the whole sky, the value of which 

 will be in no wise diminished by the photographic chart which is about 

 to be begun. 



The observations ibr the Helsingfors-Gotha catalogue were made al- 

 most entirely by J)r. Krueger with a0"'.15 (5.9 inch) Keichenbach merid- 

 ian circle. The star positions are for the epoch 1875, and besides the 

 right ascension and declination, the precession and secular variation, 

 and wherever possible the projier motion are given. The observations 

 forthe Albany zone were madeby Professor Boss with aO'", 20 (7.0 inches) 

 Pistor & Martin's meridian circle, the transits being recorded on the 

 chronograph, while Dr. Krueger used the "eye-andear " method. 



The probable errors come out : 



Experiments were made with wire-gauze screens b^"^ Professor Boss 

 to determine the effect of difference of magnitude upon the observa- 

 tions, his result being that a change of one magnitude produced a 

 change of 0».014 in the iiersonal equation in observing a transit. 



