Page:Philosophical Transactions - Volume 095.djvu/146

132 Its rotation on its axis was, in 1796, estimated at 62$3⁄4$ days, from a mean of six observations of its greatest and least brightness. Here follow about 26 similar determinations, most of them the results of very accurate observations; and as they probably will in future be compared with others, I have examined them repeatedly with the utmost care, attending particularly to the progression of their changes.

The + and — annexed to the magnitudes denote them to be more or less bright; the doubtful results are marked with dots; all the others are esteemed exact, except those of August 7, 1797, and August 21, 1801, which are in a small degree less so. From these determinations the rotation on its axis may be computed as follows.