Astronomt/ in Germany, for 1818. 91 



4-1° . 29- . 54", and for Turin 4[.5f . 4' . 0". But nothing like 

 an explanation of the irregularity between Florence and Pisa is 

 attempted. The editor, however, is disposed to give the pre- 

 ference to the trigonometrical determination. 



XXXVII. MossottVs new Mode of determining an Orbit. 



Principally applicable to the first estimation of the elements 

 of a comet. 



XXXVIII. Littrow on the Arguments of Aberration and 



Nutation. 



A mode of adapting the tables calculated for a given year to 

 any other year with little trouble. The author has arranged in a 

 short table the differences of the sun's longitude and the place 

 of the moon's node, to minutes, for the corresponding days of 

 different years from 1750 to 1830, compared with 1817 : he has 

 also added a smaller table of the allowance to be made for the 

 time of different meridians. 



XXXIX. Littrow on the Right Ascensions of the principal 



fixed Stars. 



The 36 stars of Maskelyne compared with a. Aquilae, from 

 Bessel's observations at Konigsberg. 



XL. Littrow ow the Determination of Time. 

 Recommends the employment of a circle in the manner of a 

 transit instrument, where this instrument is not at hand ; and 

 employs the pole star for the latitude. 



XLl. Planus Observations of Occultations at Turin. 

 From 1812 to 1817, 25 observations. 



XLII. Extract of a Letter from Professor Bessel. 



A determination of the law of the coefficients of the series for 

 expressing the equation of the centre and the radius vector in 

 terms of sines and cosines of multiples of the mean anomaly, ob- 

 tained from the fluents of particular expressions, when it had been 



