PREDICTION OF OCCULTATIONS. 



23 



CalGulatio7i for a mcrre accurate deteTminatk/ti of the Time, etc., of Ermrsion. 



(Table, page 20, Arg. Q 



(Table, page 20, Arg. Q 

 logrcoscp'ACOsiZ' = 



log r cos <p' A sin Z> sin if' = 

 ^ — v' = 

 p' — v! = 



(From first determination) 



H+d 



H' 



logrcoscp' 



log A 



log cos iZ' 



log u' 



log r cos (f)' A 



log sin D 



log sin £' 



log I)' 



/ 

 ncosN 



n&va.N' 



log n sin N 



logracosiV 



log tan i\^ 



log sin JV 



logji 



logm 



log cos (i¥—iV) 



logsin(illf— A") 



log m sin (J/ — A) 



, msin(JJf— A) , ^°S^ 



log ^ = log cos iL 



"^ log sin J/ 



log^sinj/ 

 , AsintL 

 log^^= log (I) 



— log ^ cos (if— A) = log(2) 



— 44°37'4 

 + 6 2.6 



-38 34-8 



+ 9.8528 



9.4184 



+ 9-8930 

 + 9.1642 



+ 9-^7^^ 



— 9-2917 



— 9-7949 

 + 8.3578 

 + .0228 



— .1824 



— .2052 

 + .1460 

 + -5546 

 + .4086 



+ 9-<5ii3 



— 9-3122 



— 0.2991 



+ 9-9S^2 

 + 9.6601 



+ 9-'°27 



— 9.4426 



— 9-9473 



— 9.6666 



— 8-7693 

 9-4354 



— 9-3339 

 + 9-9^97 

 + 9-4251 



+ 9-7650 



+ 9-3899 



Emersion : Halifax Mean Time 



(From first determination) 

 270°— A'+vl, = 



(2)+(l) = 



(From first determination) 

 moos J!f + iwcos A" = 



(From first determination) 

 msiniUf-f-insin A ^ 



(4? + (3)= = '^ = 0.0743 



(From first determination) 

 (From first determination) 



. ■u-\-tu' 



(Reduced) 



M 



324°i9^o 



N 



116 40.0 



M—N 



207 39.0 





270 00.0 



270°— A 



154 20.0 



^ 



102 27.5 



Q 



256 47-5 



(2) 



+ -2454 



(0 



+ .5821 



t 



+ -8275 



log* 



+ 9-9178 



logm sin A" 



+ 9-6113 



log <w sin A 



+ 9-5291 



log w cos A" 



— 9-3122 



log < re cos A" 



— 9.2300 



<mcosA" 



— .1698 



mcosiW 



+ .1029 



(3) 



.0669 



iMsinA" 



+ -3382 



m sin M 



- -0739 



(4) 



.2643 



(4)=^ 



.0698 



(3)= 



•0045 



Check 



■0743 



logii' 



+ 9-1642 



log^w' 



+ 9.0820 



log«' 



+ 8-3578 



log<»' 



+ 8.2756 



tv' 



+ .0189 



V 



+ -7851 



V + tv' 



+ .8040 



tu' 



+ .1208 



iC 



- -5005 



u + tu' 



- -3797 



log(w + ttc') 



— 9-5794 



log(v + tv') 



+ 9-9053 



log tan P 



— 9-6741 



T + d 



13 4*5-6 



t 



+ 49.7 



T + d + t 



14 35-3 



P 



-25°i6!5 



Q 



256 47.5 



- V 



231 31.0 



Emersion Angle from North Point = 

 Emersion Angle from Vertex = Q -{■ P =^ 



This last determination of the time of emersion is probably true to the nearest tenth 

 of a minute. The angles Q and Fare also determined with corresponding precision; 

 but for these, the nearest degree is sufficient for the purpose of making an observation. 



