Leonid Stream which the Earth encountered in 1898. 325 



or, neglecting the second power of the eccentricity we may, without 

 loss of accuracy, write U = 1 /E. 



In Table II are given the values of the Sun's longitude (©), the 

 longitude (/), the right ascension (a) and the declination (d) of the 

 apex, and the orbital velocity of the meteors (v), all of which can be 



Table II. 



Time. 



© 



■ 



Log E. 



• 



I. 



a. 



d. 



v. 



1898, Nov., 14 -0 

 14*5 

 15 -0 



232° 9' -8 



232 40-0 



233 10-3 



9 -99514 

 •99510 

 •99505 



142° 52' -8 

 143 22-7 

 143 52-7 



145° 13' -7 



145 42 -7 



146 11-9 



+ 13° 53' -8 

 44-0 

 34 -1 



1 -3877 

 •3878 

 •3879 



computed from the ' Nautical Almanac ' or from Adams's orbit of the 

 meteor stream. These are given for three epochs, viz. : — November 

 14'0d., 14'5d., and-15-0d., from which their values at the time of each 

 observation may be obtained by interpolation. All of these quantities 

 are needed in the subsequent reduction of the observations, or for 

 deducing the elements of the orbit. 



We next compute the quantities u, w, and ?/, exhibited in Table III. 



Table III. 



No. 



u. 



w. 



'/■ 



1 



2-3779 



2 -4075 



22' 



2 



•3718 



•4014 



19 



3 



•3782 



•4078 



10 



4 



•3680 



•3977 



15 



5 



•3725 



•4021 



15 



6 



•3748 



•4044 



29 



7 



•3845 



•4140 



22 



8 



•3767 



•4063 



15 



9 



•3857 



•4152 



29 



10 



•3821 



•4116 



20 



11 



•3799 



'4094 



11 



12 



•3736 



•4032 



27 



13 



•3724 



•4020 



15 



Applying the corrections for the earth's attraction, da. and d8, to the 

 E.A. and declination from the formulae 



da = 7] sin p sec S • d8 = —tj cosp, 



p being the parallactic angle, we find the corrected E.A. and declination 

 of the radiant, as given in the second and third columns of Table IV. 

 In the next two columns of the same table are found the longitude (L') 

 and latitude (B') of the same points, and in the sixth and seventh 



