History of Astro7iomy for the Year 1803. 219 



13,000 ; memoirs and observations by baron von Zach and 

 M. Ciccolini, Delambre, Mechain, Vidal, Flauguergues, 

 Goudin, Sorlin, Lalande uncle and nephew, Burckhardt, 

 Nouet, Chabrol de Murol, and Thulis ; \vith the History 

 of Astroiipmy tor the years 8 and 9, to serve as a continua- 

 tion ot that given for the preceding years since 1 782. 



The Comioissance des Temps tor the year 14 is on the point 

 of appearina" : it contains all the calculation? of the moon 

 made from our new tables for the use of the navy, with 

 a great number of observations, tables, and memoirs, by 

 Laplace, Delambre, Vidal, Herschel, Messier, Burckhardt, 

 Lalande uncle and nephew, Olbers, Thulis, Flauguergues, 

 and Duc-la-Chapel!e ; the history of astronomy for 1802 ; 

 supplements to iny Bibliogntphie ; tables of aberration for 

 140 stars, a twelfth catalogue of new stars, a table of the 

 changes in longitude and latitude for 6OO principal stars, 

 the measurement of the degree in Lapland, and a table Of 

 all the articles contained in the forty-five last volumes of 

 the Connoissance des Temps since 176O, when I began to 

 keep a register of the annual progress of astronomy. 



M. Leoendre has given to the Institute a new formula 

 for the reduction of the apparent distances, with tables for 

 simplifvinc the use of them : there are already a great num- 

 ber : we shall have an opportunity of choosing that which 

 appears the easiest and shortest. 



M. de Laplace has jjiven in the Bulletin a theory of the 

 deviation of falling bodies, in consequence of the expe- 

 riments of M. Guglielmini and Henzenberg. The result 

 is, that the deviation ought to be null towards the south, 

 though M. Guglielmini found it to be three lines. But 

 these experiments are so ditficult to be made, and the resist- 

 ance of the air so little known, that this does not impeach 

 the results of AL Guglielmini. 



The Ephemerides of Milan for 1502 contain observations 

 of Mercury; of the occultation of the Spica Virginis on the 

 30th of March 1 801 ; tables of the annual parallax of Mars, 

 of the precession of the stars, and of the motion peculiar to 

 a Sfreat number of them. 



Those of 1803 contain the perturbations of Piazzi's planet 

 by M. Oriani, and observations of that planet and of that of 

 Olbers. 



M. Laurent Regnicr, professor of astronomy at Upsal, 

 has published a dissertation De Masiis Cometurum. 



The Ephemerides of Vienna i'or 1B04 contam observa- 

 tions of diflfcrent places by M, Triesnccker and M. Burg. 



The 



