21S 



OCCULTATION OF ALDEBARAN 



Application of the calculation of the observation at Gotha. 



Latitude— Vertical angle=50° 47' 41" 49. Logarithm of the radius=9,9992171 



Radius at the Pole 9,9986978 



Immersion. Emersion. 



oil) o i a 



H=Altitudeof the nonagesime 

 N=Distance of the £ from the nonages. 

 N-J-Parallax in longitude 

 L Latitude of the moon by the tables 

 Horizontal polar parallax 



56 34 06 



58 23 10 



59 04 34 



5 5 50 8 

 57 30 24 



54 01 40 

 65 06 30 

 65 49 10 

 5 05 44 2 

 57 28 70 



Sine horizontal polar parallax. 

 Logarithmic radius at Gotha. 7 

 Logarithmic radius at the Pole. \ 

 Co-arithmetical cosine latitude of the moon. 

 Sine altitude of the nonagesime. 

 Sine (N + parallax in longitude) 



P*=Sine parallax in long. = 

 Cosine latitude of the moon. 

 Co-ar : sine N. 



. 41' 22" 79 



8,2234038 .... 



0,0005193 .... 



0,0017209 .... 



9,9214490 .... 



9,9334117 .... 



= 8,0805047 Sine P.=42' 39" 22 



9,9982791 .... 



0,0697644 .... 



Constant logarithm 8,1485482 



Cotangent H 9,8196570 



Cosine latitude apparent of the moon 5° 39'50'' 9,9978740 



Sins Q=31' 47" 71. 



5° 41 17 



8,2232030 



0,0005193 



0,0017200 

 9,9081105 

 9,9601182 



8,0936710 

 9,9982800 

 0,0423423 



8,1342933 

 9,8608182 

 9,9978563 



7,9660792 Sine Q=33' 49" 55 7,9929678 



Constant logarithm. . . , 



Cosine (N + iP.) 



Cosine apparent latitude of the moon. 

 Tangent the true latitude of the moon. 



8,1485482 

 9,7152204 

 9,9978740 

 8,9505967 



8,1342933 

 9,6183552 

 9,9978563 

 8,9504777 



Sine Ql=2' 13" 86. 



Parallax in latitude=QJ-Ql 



6,8122393 Sine Q\ 1' 43" 61. 6,7009825 



34 01 57. Parallax in Iatitude=Q_-J.Q>=35 33 16 



Parallax in longitude "" 41 22 79. Parallax in longitude ~ 42 39 22 



Difference of apparent latitudes in the interval. . . . 1 25 



Difference of apparent longitudes do. . . . . 21 21 



Y =*mean apparent latitude of the moon + latitude of Aldebaran? = 503449 





Apparent inclination of theorbit 3° 48' 51 



Apparent semidiameter — 2" inflection 



Angles of conjunction. 



We have the distances of the apparent conjunction, j g" 



Difference of apparent latitudes. j^ 



True conjunction in apparent time 

 Latitude of the 3) by the table at the imm. 

 Parallaxes in latitude. 



s 



arc or chord 1277" 76 

 15' 48" 38 

 15 46 33 

 46° 17' 18" % 

 38 31 26 

 I.= 11 28 78 

 9 52 51 

 10 55 35 

 E 12 20 35 

 18i- 40' 06" 1 

 =5° 5' 50'' 80attheem.= 5° 5' 44" 20 

 +34 1 57 +35 33 16 



(a) Apparent latitude of the 3) by the tables 5 39 52 37 

 Difference of latitudes observed. — 10 55 35 



Lat. of the 3> in the region of the star. 

 Latitude of Aldebaran. 



Error of the tables 



5 28 57 02 

 5 28 49 00 



— 9 00 08 02 



— 00 08 01 



