.504 Mr ROTHMAN-S OBSERVATIONS OF HALLEY'S COMET. 



23. 6.26. 6 - 27,5 - 4.27 



Having applied these diflferences to the places of the respective 

 stars, as given in the accompanying Catalogue, I have obtained the ap- 

 parent places of the Comet for the respective times of observation ; and 

 then applying the proper correction for parallax, I have got the geo- 

 centric places. In calculating the parallax, the Comet's distance from 

 the Eartli \\as deduced from Mr Stratford's Ephemeris. 



