APPENDIX. 



Transit of Mercury over the Sun's Disc on the 4th November, 1822. 



Observed by Mr. Walter Ewer at Kurnal. 



Mean time of 2nd internal contact, . . 

 external ditto, .... 



...... 



Difference, .... 



End of transit of $'s centre, 

 Observed by Mr. William Cracroft at Jionpoor. 

 Mean time 2nd internal contact, .... 

 external contact, «... 



End of Transit of g's centre, .... 



Observed by Lieut. Maxwell at Meerut, with an inferior telescope. 



Mean time 2nd internal contact, ■ . ■ 



external contact, 



End of Transit of S's centre, i . . . 



Observed at Calcutta by 



Capt. Hodgson. 



h. to. s. 

 Apparent solar time of i 01 54 ^ ^ 

 2nd internal contact, ) • ' 



external ditto, 21 57 01 



Capt. Herbert. 

 h. in. s. 

 21 54 57,1 



21 57 10 



Mean end of Transit, 21 55 54,5 21 56 03,1 



h. m . .<?. 



20 43 46,5 



20 56 16,5. 



2 30 



20 55 01,5 



21 16 08 

 21 18 48 



2 40 



21 17 28 



20 57 17,2 



20 59 03,6 



1 4(5,4 



20 58 10,4 



Capt. Schalch. 



h. m. s. 



21 55 01,8 



Uncertain. 



21 56 14,8 



21 56 04,1 

 16 02 17 



Greenwich time 5 53 47,1 = Long - , of Calcutta. 



As the effect of parallax for the above four places is small, from the displacement 



of Mercury being nearly in the direction of the tangent to the sun's disc at the point 



of Emergence, the longitudes of the places, found by the differences of mean time, 



will not be far from the truth : therefore assuming Calcutta to be in longitude 5 h. 



53 m. 30 s. according to Captain Schalch's observations we shall have 



Ji. m. s. 

 Jionpoor, 5 31 09 east of Greenwich. 



Meerut, 5 11 51,4 



Kurnal, 5 08 42,3 

 B 



