2M TRANSIT OF VENUS, 1874. WAIMEA. 



At Waimea, Mr. Dunn's station was 60 yards N.E. of Mr. Johnson's. The 

 time of his observation was recorded, from the Solar chronometer L, by 

 Sub-Lieut. Warleigh, of H.M.S. Reindeer. He made use of the power 67. 



Mr. Dunn writes : 



" Before internal contact, J or ^ of the planet being still off the Sun's disk, 

 I saw light all round the planet. My impression was that I was deceiving 

 myself, through wishing to see the whole disk, but I failed in endeavouring 

 not to see this ring of light. When I say % or | of the planet not being yet 

 on the Sun's disk, I mean some considerable interval before the internal 

 contact. I have not experience enough to judge such things, and I did not 

 mark the time. As the moment of contact approached, a sort of misty, 

 smoky, or woolly cloud seemed to be where we looked for the black drop. 

 The time recorded [3 h . 39 m . 1J S ] was when I was sure of sharp clear light 

 between the planet and the outer limb of the Sun. The instrument was 

 unsteady through the wind, blowing sharply from S.W., just about the time 

 of contact, and my own impression was that I was decidedly late. . 



" Having to leave Waimea an hour after the contact was observed, 

 Mr. Johnson undertook the comparison of chronometers, &c. 



" 1874, December 10. R. DUNN." 



For Mr. Johnson's observation of internal contact we have 



h m s h m s 



Recorded times by the f 20. 46. 53 o 1 M . 2Q _ 6> 5 g 



Sidereal chronometer N |_ 20. 47. 2 '3 J 



Adopted Correction of N (Table VI.) 7. 36 47 



Local Sidereal Time - - 20. 3g. 21 18 



Assumed Longitude West - 10. 38. 3g'8o 



Gieenwich Sidereal Time - 7.18. 0-98 



Local Tabular Distance of Centers - i5'. 3;" '56 



Whence the following final equation, assuming, as before 



R = 976"'8o, r = 3i"'42, 



7"- 82 = o"-228o n +-6535 8 R.A. 7o58 8 N.P.D. o"-o34O 8 t S R + 8 r. 



For Mr. Dunn's observation we have 



h m a 



Recorded time by Solar chronometer L 3. 3g. i 26 



Correction of L (Table VIII.) - 9. 58 -47 



Local Mean Solar Time - 3. 29. 2-78 



Local Sidereal Time - - 20.39.39-69 



G. L. T. 



