5G8 REPORTS OF AMERICAN OBSERVATORIES. 



V. Principal publications of tue observatory during 



THE YEAR 1879: 



1. C. L. Doolittle, Observations of Jupiter's Satellites, published in 

 Ast. Nach. 



2. C. L. Doolittle, Mean declinations and proper motions of 58 stars, 

 and the latitude of the Sayre Observatory, in Ast.]Sach., vol. 95, page 49. 



Location : Tarrytown, Westchester County, New York. 



Position : Latitude, 41° 04' 21" north ; longitude, 73° 51' 14" west, 

 Greenwich. 



Authority : United States Coast Survey. 



The instrumental outfit under my control is so meager and unimpor- 

 tant as not to warrant an entry under the headings given above. 



The principal work done during the past year has been in connection 



with the observations taken at Central City, Colo., at the time of 



the solar eclipse of 28th July, 1878. As a member of the party in charge 



of Prof. E. S. Holden, I determined the residuals between the times of 



observed contact and the instants obtained by computation from the 



lunar tables. 



Chas. H. Eockwell. 



Location oj observatory: (City) Pougkkeepsie ; (County) Dutchess; 

 (State) New York. 

 Name of observatory : Vassar College. 



Longitude from Washington, 12 m , 38 8 .5. 



Latitude 41° 41' 18". 



I. Personnel : 

 Director, Maria Mitchell. 



II. Instruments : 



(a) Meridian circles : 1 ; maker, Young, of Philadelphia ; aperture of 

 objective, 3| inches. 



(c) Equatorial instruments : Makers, object glass byCLARK; aperture 

 of objective, 12J inches; magnifying powers of eyepieces, 200 to 000+ . 



(/) Chronographs : One. 



(g) Gloclcs : One clock sidereal ; makers, Bond & Son. 



(h) One chronometer : Meantime; makers. Bliss & Creighton. 



(?) Miscellaneous : Small telescopes ; one by Clark & Sons ; aper- 

 ture, 3 inches. 



III. Observations during tiie past year: 



(a) Observations for time. 



(&) Observations on planets, especially Saturn. 



(i ) Observations on Sun spots. 



