578 REPORTS OF EUROPEAN OBSERVATORIES. 



The spare time was principally employed in determining the definite 

 position of the (521) Bradley stars, and their mean positions turned 

 over to Professor Anwers. The catalogue containing the (2,100) obser- 

 vations is to be published by the observatory. 



Dr. Knorre observed with the 9-inch equatorial on determination of po- 

 sitions. 



The new micrometer for the measurement and registration of differ- 

 ences of declination, described by Dr. Knorre in vol. 93 (p. 3G3) of the 

 Astronomische Nachrichten, was brought into service in determination 

 of 572 stars. 



The time-service has been continued. The results of the service car- 

 ried on jointly by the Berlin, Konigsberg, and Hamburg observatories 

 will probably be published shortly. 



The principal work of the computing bureau has been, as in former 

 years, the publication of the Astronomisches Jahrbuch. 



Of the ephemerides of the 529 stars of the Astronomical Society the 

 volume for 1879 was published ; 22 circulars (83-104) were issued, and 

 in them will be found 43 computations of new elements and G2 ephemer- 

 ides. Of the former 33, and of the latter 47, were computed in Berlin. 

 Of the " Correspondeuzen liber Planetenbeobachtungen," Nos. 4G-08 

 were issued. 



UNIVERSITY OBSERVATORY, BONN. 

 (Professor E. Sciionfeld, Director.) 



The progress of the work has been greatly retarded by the unfavora- 

 ble state of the weather and by a change in the personnel. Dr. Seeliger 

 resigned, and his place was occupied by Dr. Deichimiller, who again was 

 succeeded by Mr. Emil Kaiser. 



The meridian circle was used in observing 53 zones and adding some 

 important fragments, containing 3S0 stars of comparison and 1,707 zone 

 stars. Six hundred and twenty-seven zones have been observed. 



The southern review with the Schroder telescope, Mr. Kerper assist- 

 ing, resulted in the determination of 44,204 star positions, which were 

 partly reduced to 1855. 



One hundred and two special catalogues were commenced and 46 

 completed. 



A catalogue of doubtful observations has been commenced, contain- 

 ing now 780 numbers. 



State of icorlc December 31, 1878. 



1. Zones : 395, G hours, containing 189,G0G star observations. 



2. Computation of reduction tables: no arrears. 



3. Computed star positions: 3,000 in arrears. 



4. Special catalogues of l h and 1° extension : Commenced, 439 ; arrears, 

 65; mostly finished, 1<><>: complete, 100; without any doubt, 22. 



5. Distribution of the observations. 



