132 JOHN TEBBUTT. 



places with the parallax corrections derived from my first 



approximate orbit are as follow : 



Windsor mean time. a § 



d. h. m. s. h. m. s. s. ° ' " " 



April 3 8 43 3 2 30 46-11+0-97 



„ 22 7 2 25 5 39 6-82 + 1*28 



May 11 6 48 25 9 26 2-33 + 0-19 



Reducing the times to the meridian of Greenwich, correcting 

 them for aberration and adopting the ecliptic as the fundamental 

 plane, these places referred to the mean equinox of 1894-0 are 



—55 



34 



52-1—50 



—45 



50 



5-5—0-2 



+ 16 



59 



21-5—15-1 



Greenwich mean time. 





A 







P 





d. 

 April 2-93926 



358 



33 



o-i 



—63 



25 



27-3 



„ 21-87188 



79 



45 



59 6 



—69 



6 



18-7 



May 10-86205 



138 



29 



41-3 



+ 1 



46 



48-5 



In the determination of my first approximate orbit I adopted 

 the ratio of the time intervals between the first and second and 

 the second and third observations in obtaining the ratio M of the 

 curtate distances for the first and third observations, and since 

 these two intervals were nearly equal the resulting value of M 

 proved to be very satisfactory. In computing my second orbit, 

 however, I employed the complete expression (33) given by Pro- 

 fessor Watson in his Theoretical Astronomy, Ed. 1869, p. 178, the 

 radii vectores and anomalies of the comet for the three fundamental 

 positions being derived from the first approximate orbit. The 

 value of M came out as 1*15808 and this with the curtate distance 

 0*386468 for April 2 was found to satisfy Euler and Lambert's 

 well known equation, and gave the following system of parabolic 

 elements : — 



d. 

 Perihelion passage, 1894, April 13-51310, Greenwich mean time. 



Distance of perihelion from ascending node 324 17 8*6 



.longitude of ascending node from M. Equinox 1894*0 206 20 56*5 



Inclination of orbit 87 4 6*2 



Perihelion distance 0*983392 



Heliocentric motion Direct 



It will be seen from a comparison of these elements with my 

 first determination from an arc only half as long that the latter 



