1818.] Temperature of Nice. 179 



Remarks. 



FiHe ; windy; Cirri. 

 Very fine ; windy. 

 Fine; windy; Cumuli. 

 Fine ; Cirri. 

 Fine. 



SIX MONTHS OF OBSERVATION. 



Very fine, or fine days, about , 130 



Rainy, or on which auy rain fell to my knowledge 27 



Article IV. 



Memoir relative to the Annular Eclipse of the Sun, which will 

 happen on September 7, 1820. By Francis Baily, Esq. 



[The following essay, a few copies of which have been printed 

 for private distribution, was transmitted by the author to the 

 Editors of the Annals. The interesting nature of the subject 

 will, they are persuaded, render it acceptable to their scientific 

 readers.] 



J" E ? oIar eclipse which will happen on Thursday Sept 7, 

 1820, will be the greatest of all those which have happened in 

 this part of Europe ever since the year 1764 ; and indeed of all 

 those which will again happen here before the year 1847. Like 

 the two eclipses above alluded to, it will be annular: that is, the 

 disc of the moon will not wholly cover the disc of the sun ; but, 

 in certain parts of the earth, the sun will show the appearance 

 of an aunulus, or ring, round the body of the moon ; the position 

 and magnitude of which will depend on the situation of the 

 spectator. In no part of England, however, will this annular 

 appearance be observed : * but, on the continent, in any part of 

 that tract of country which extends nearly in a straight line 

 from the north of Westphalia to the south of Italy, the inhabi- 

 tants will have an opportunity of beholding this singular pheno- 

 menon. r 



Annular eclipses do not appear to have been noticed by the 

 ancients who probably confounded them with partial ones. 

 Jiuleed, the only authentic accounts of any well observed annular 

 eclipses in this part of Europe (besides the one in 1764 above- 

 mentioned) are those of Feb. 18, 1736-7, and of July 14, 1748;f 



* The eclipse, however, will be annular in the Shetland islands : and it will be 

 ercoMiderabJe magnitude along the whole eastern coast of Oreat Britain. 



tlJ,, in .i 1 SS £ account of these eclip.es, and of the- phenomena attending 

 them, in the 1'h.l. Trans, vol. xl. p. 177, and vol. xlv. p. 582. 



M 2 



