ASTRONOMY. 



87 



Professor Celoria is computing the longitudes of Monaco, Padua, 

 Vienna, Milan, Naples, and Genoa. The time is furnished to the 

 city of Milan. 



University Observatory, Mannheim. 



Dr. W. Valentiner, Director. 



The cluster G. C. 4410 has been observed assiduously, so that to 

 determine the positions of its 40 stars about 2000 differences in right 

 ascension and about 1000 differences of declination have been made. 

 Two other clusters, G. C. 1166 and G. C. 1454, are observed also, and 

 will probably be completed during 1878. The reduction of the 

 Meridian observations of Barry is so far complete that the printing 

 has already begun in the Jaliresbericlite of the Maniiheimer Verein far 

 Naturl'unde. Nine hundred and thirty-two stars were observed by 

 Barry (about 1805) 2573 times, or an average of 2.8 times per star. 

 The probable error of a right ascension of such an average star is 

 0.089 s . The library of the observatory contains 1400 titles. 



University Observatory, Moscow. 



Dr. Th. Bredichin, Director. 



In brief, the work of this observatory has been Meridian-circle ob- 

 servations of Mars for parallax, and of various stars ; micrometric 

 observations of the cluster in Perseus ; comet observations ; spectrum 

 of comet 1877, II.; spectroscopic observations of the sun; and pho- 

 tographic observations of the sun and of groups of stars. 



Vol. IV. of the Moscow Observatory, 1878, has arrived in this 

 country. It is in quarto form, and in two parts. Part I. contains : 

 1. Meridian-circle observations of stars of a selected list. 2. A 

 second memoir on the anomalous forms of comets' tails, by Pro- 

 fessor Bredichin. This deals with comet 1861, II. 3. Meridian 

 observations of Mars in opposition and comparison stars, by M. 

 Gromadski. These observations extend from July 18 to SejDtem- 

 ber 24. The probable error (AS) of a single observation is 0.58". 

 Each observation of this series combined with one of the same weight 

 in the southern hemisphere w r ould give the solar parallax wuth a 

 probable error 0.19", and hence from twenty such corresponding 

 observations we may expect a value of this doubtful by 0.04". 4. 

 This section is devoted to Meridian observations of a sjDecial list of 

 stars. 5. Spectrum of comet 1877, b. Dr. Bredichin finds this to be : 

 A, 556.4 1.7 ; B, 515.4 0.7 ; C, 469.7 2.2. For Coggia's comet 

 these numbers are : A, 563.0 ; B, 516.0 ; C, 471.1. For the spectrum 

 of "lenzine" they are: A, 563.2; B, 516.4; C, 471.2. Part II. con- 

 tains: 1. Observations of Mars and comparison stars with the Equa- 

 torial. 2. Measures of stars in the cluster in Perseus. 3. Photomet- 



