An Emersion of Jupiter's second Satellite. h 25th December, by watch emerged 6.04.40 Watch flow +40.26,6 A Comparison of the Observations for Longitudes with corresponding Observations at different Places, to fix the Longitudes of those which were undetermined. By T. D. PEARSE. As this was not of the beft, I reject it. 5.52.55 1779, November 23d. I reject the beginning, because, when compared with Tycho in the former part, it appears, from a like comparison of the Greenwich obfervvations, that it is erroneous a full minute. The first Copernicus Copernicus is also rejected. And by comparing the end doubtful with Tycho and Copernicus of the latter part in both fets, it appears to be the observation that must. be compared with the end at Greenwich. From the beginning of 1774, till the 27th of December 1777, the observations were made with a middling 18 inch reflector. I allow 24" to compare it with the large reflector at Greenwich, and 12" for their refractor. The comparison is of actual correfponding obfervations, except in two cafes, in which the Calcutta obfervations are one revolution later. The Longitudes of Paris and Stockholm are taken from WARGENTIN, Phil. Tranf. vol. 67. LUNDEN, from thirty three correfponding obfervations found in that fame paper. Of Chislehurst, from WOLLASTON, vol. 74. Of Geneva, Oxford, and Marseilles, from PIGOT, vol. 68 and 76. Nagpoore and Chunargar were communicated to me by Lieutenant EWART, of the Bengal eftablishment, who obferved at each place a confiderable time. |