26 



MR. RUMKER'S OBSERVATIONS 



1828. 



July 21 



July 22 



July 23 



Stars. 



P. XIV. 280 

 30 Librae 



Yj Librae 

 S Librae 

 49 Librae 



P. XVI. 251 

 29 Ophiuchi 

 674 Mayer 

 1) Ophiuchi 



Interval. 



+ 16 45.08 

 + 30 37.68 



— 5 37.05 

 + 4 1.13 

 + 10 39.55 



+ 8 56.27 



+ 11 0.35 



+ 17 28.37 



+ 19 43.53 



1828. 



July 24 



Aug. 20 



Aug. 21. 



Stars. 



P. XVIII. 25 

 728 Mayer 

 P. XVIII. 91 



689 Mayer 

 266 Bod. Ophi. 



745 Mayer 

 1 2 Sagittae 

 738 Mayer 



Interval. 



4- 22 48.64 

 + 35 31.07 

 + 36 47.43 



+ 

 + 



7 4.04 

 18 21.3 



+ 17 



+ 28 

 + 8 



13.11 



28.60 

 19-92 



It is necessary to remark that the intervals are not given with regard to the 

 moon's centre; but before full moon with regard to her first, and after full 

 moon with regard to her second limb. 



Calculation of the Longitude from the preceding Observations. 



The solar eclipse of the 16th August, 1822, gives according to my calcula- 

 tion, without allowance for inflexion and irradiation, for true conjunction by 



^^^^^^S 21^ 25- 5f32|^^^^ p^^.^^^^^^ 



End 25 42 .40 J ' 



Professor Wurm, who has computed this eclipse, finds the true conjunction 

 by Beginning ... 21'' 25™ 45^53 — 0.907 .r 



End 00 25 52 .77 X 0.238 x 



And after applying the corrections for the Moon's place... d =21'' 25"" 55^88. 



From the occupation of Antares 10th April, 1822, Professor Wurm has 

 calculated the corrected conjunction 17'' 29™ 18'.25. My calculation gives 

 it 17'' 29'" 16^45. 



I found from the immersion of Antares 4th February, 1823, the true con- 

 conjunction 20'' 46"" 58'.78 — 0^698 x. And Professor Wurm has found 

 it 20'' 47'" 9'.64 — 0''.72.r. 



But Professor Wurm, to whose indefatigable exertions Geography is so much 

 indebted, having calculated the occultations observed at Paramatta as far as 

 he was in possession of them, and could identify the stars, I can do no better 

 than give the. results of his calculations in preference. The longitude de- 

 duced from Spica, 23rd December, 1826, is alone, by my calculation, this 

 observation not having been as yet communicated to Professor Wurm. It is 



