On the Solar a?id Lunar Periods. 



I/l 



at 365 days 5 hours 48 min. 51-6 seconds. M. Delambre in 

 his Astronomy has finally fixed it at 365 days 5 hours 48 niin. 

 50 sec. being nearly the same result as that obtained by M. 

 Burckhardt. The tropical year ot 365 days 5 hours 48 niin. 48 

 sec. appears fi'om the latter statements to be rather too little ; 

 but as the solar year is decreasing, it is evidently the best to be 

 adopted in the reformation of the calendar — Fide my remarks 

 on the proposal for establishing a more correct account of civil 

 time, in Phil. Mag. vol. 55. p. 350. The true solar year at the 

 commencement of the present century appears to be 



Days. hrs. min. sec. 



365 5 48 50 

 Sid. year (Syst. du Monde, ed. 4th) 365 6 9 1 1-5344*. 

 Synodic period D (do.) .. 29 12 44 2-8 (very 



nearly). 

 From which I have calculated the following particulars (and 

 which I trust are as correct as any at present published). 



Circles. S. „ / // 



Anom. rev. of the J) 

 Synodic rev. of the D 

 Rev. of the ]) to her J3 

 Rev. of the © to the ]) 's S 

 Trop. rev. of the ]) 's perigee 

 Sid. rev. of the 5 's perigee 

 Trop. rev. of the }) 's £3 

 Sid. rev. of the )) 's £J 



One synodic rev. )) contains 



27 13 18 33-239828 



29 12 44 2-800000 



27 5 5 35-703570 



346 14 52 36-760457 



3231 11 14 45-13:]01S 



3232. 13 4S 53 019600 



6798 6 50 41-814208 



0793 9 22 45-984000 



29 12 44 2-8 



Days. Ill's, min. sec. 

 N. U. TliB anomalistic year rontains J(i5 (i i.'i WJ--2'\2m 



Y 2 -Motion 



