LONGITUDE OF OBSERVATORY BAY. 419 



The following comparisons were then made : 



h m a h m s 



Chronometer Frodsham 3i;8 .... 1 1. 21. 40-5 "1 1 1. 36. 5o-o 1 



"Rnna.torml-p.lopk . 5. 17. 23'oJ 5. 32. 35'oJ 



Equatorial-clock 5. 17. 23 'o . 



Chronometer Frodsham 3178 .... 11.26. i5 - 5l 11.29. i5' 



Transit-clock 5. 22. 41-0 / 5.25.41' 



With the Error and Rate of the Transit-clock in Table V., the Equatorial- 

 clock is inferred to be l m . 12 S '76 slow on local sidereal time. Hence we 

 have : 



Local sidereal time of disappearance 5 h . I2 m . i3"*26 



Assumed corrections 



to the Moon's Tabular Geocentric R.A o s% 55 



N.P.D -."-7 



to the horizontal parallax for latitude 6"' 96 



to the semidiameter (Breen's correction) 2" - oo 



Augmentation of the semidiameter +4" 'So 



For the mean place of 9 Tauri for 1874'0 



Greenwich Catalogue for 1864 



R.A. 3 h . 29. 33 s -5g (4 obs.) N.P.D. 67. 12'. 2 7" -4 (4 obs.) 

 Greenwich Catalogue for 1872 



R.A. 3 h . 29. 33"-57 (3 obs.) N.P.D. 67. 12'. 27"'o (2 obs.) 

 Reduction to apparent place, 1 s 2 1 " ' 3 



1874, December 20 / 



Adopted apparent place of 9 Tauri 



R.A. 3 h . 29. 37 s -58 N.P.D. 67. 12'. 5" -9. 

 Assumed astronomical co-latitude 40. 34'. 48" ' i S. 



h m s h m a 



Assumed East longitudes 4.39.24-00 4.39.44-00 



Greenwich Mean Times, December 20 6.36. 7 '83 6.35.47*88 



Apparent R.A. of Moon's center 3. 28. 46*06 3. 28. 45*21 



O I II O I II 



,, N.P.D. ,, 67.23.24-9 67.23.28*8 



in t It 



Distance of star from Moon's center 1 6. 24 53 1 6. 35 * 73 



Moon's augmented semidiameter 16. 3i'ii 16. 3fii 



Inferred longitude East of Greenwich... 4". 39 m . 35 8 *8. 



The occultation of 9 Tauri was also observed at the American Station 

 at Molloy Point. Professor S. Newcomb kindly communicates that the 

 longitude of Molloy Point inferred from the occultation is 



4 h . 40 m . 2P-7 East of Greenwich. 



