Remarks on Ancient Eclipses. 439 



medium ; nor can I conceive liow it is possible for these waves to 

 give the mind any distinct idea of figure or colour, either by the 

 sense of seeing, or, as it seems to be the mode, by the sense of 

 feeling. 



LXX. Calalogjie of Ancient Eclipses, with the Dates of their 

 corresponding Eclipses at one a7id two Periods Distance. 

 With Remarks, By Mr. Thomas Yeates. 



[^Continued from p. 347-] 



To Mr. Tilloch. 



Sir, In my Remarks on the Ancient Eclipses, page 348 of vour 

 Magazine, I have suggested the idea of the whole ecliptic phseno- 

 mena being comprehended in the space of 912 solar years, and 

 have produced some convincing examples that the hypothesis is 

 not improbable : these examples are submitted with deference to 

 such of your readers as are practitioners in these calculations, 

 and who are disposed to listen to useful discussion. 



In the next place I propose to show, that not only the same 

 eclipses return at the expiration of one or more complete periods, 

 but also the same seiies of eclipses returns in true succession. 

 This being a very important point to examine, it constitutes the 

 subject of this paper : I take it for granted, that the great astro- 

 nomical year commencing with the Nabonassare^n sera is a true 

 epoch for computing the Julian equation according to Rem. XI. 

 page 345, and that the dates of those eclipses subsequent to that 

 period must be corrected on that principle. 



The manner proceeded on is simply this; 1st. The first co- 

 lumn gives the historical dates as per table, Phil. Mag. p. 244. 

 2d. The second column shows the equation to be added accord- 

 ing to the rate of 1 1 minutes per annum from the aforesaid 

 epoch. 3d. The third column shows the equated or true time 

 of the said eclipses; and, 4th. The fourth column shows the 

 corresponding dates. Tiie Julian equation at the rate of seven 

 days for one period, and 14 days for two periods ; less by four 

 days for one, and eight days for two periods ; which leaves six 

 days for two periods to be added for dates preceding the Gre- 

 gorian and New style, is added afterwards for want of room. 



Before Dates of 



Christ. Eclipses. 



D. H. M. 



721 j) March 19 10 34 

 720 )) March b 11 56 

 72U -^ Sept. 1 10 IS 



