( 646 ) 



By means of these tables it is not dil'tionlt to inlei^rate the pertur- 

 bations for an arbitrary epoch according to the known expressions 

 of the mechanical quadrature. As a new osculation epoch I have 

 chosen 



1906 January 16.0 mean time Greenwich 

 and I have found: 



A i = -f 40"34 hSl = - 3' 32"48 



A ft = + 1"258874 jM^ = + 883"5368 



A,M=: - 1147"7070 A jr = + 8' 2"08 



A y r= + 3' 2"01 

 hence the new elements become : 



epoch and osculation 1906 January 16.0 mean time Greenwich 

 M^z= 1266412"143 

 H= 517"447665 

 %a = 0.557 4267.74 

 y = 24°20'25"55 

 6 = 0.412 1574 

 1= 20°48'50"63 l 

 jr = 345 57 30.35 1900.0 

 SI = 331 40 36.47 | 



From these disturbed elements we derive for the time of perihelion 

 passage 



1906 March 14.1804 mean time Greenwich 

 while the original system VII, without regard to the perturbations 

 during the period since 1899 June woidd give 

 1906 March 13.8083. 

 If we take into account that the small retardation of not yet 9 

 hours is compensated by an increased longitude of the perihelion of 

 8', we find a posteriori confirmed, what could have been foreseen, 

 that the perturbations during the second revolution liave only slightly 

 affected the places of the comet in space. 



By reducing the elements i, Jt and Sh (o the mean equinox of 

 1906.0 I find 



i=z 20^48'53"80 1 

 rtz=z 346 2 31.63 1906.0. 

 SI = 331 45 40.75 1 



In order to compute from these elements an ephenieris I have 

 derived the following expressions for the heliocentric coordinates of 

 the comet referred to the equator : 



