titflorj of Ajlikinoihy for the Year 1799. IC7 



eeritUr'y. In 1700 there were many papers on the fame fub- 

 jecl ; but it is fufficient to confider that centuries are counted 

 like every thih^ elfe, from one to a hundred, and therefore 

 it is t8oi that njull begin the new century. The only thing 

 Ihat could occafidn this error is, the tranfition from 17 to 

 18 hundreds. It has appeared to nianv people that this is 

 changing the century. 



C. Taillardat has publiflicd a fmall work entitled Horlogr. 

 du labotireur, or an eafv method to difcover the hour of the 

 night by the afpeft of the Itars, with figures of the conftella- 

 tions, and the months when they are feen in the evening. 



The Marine, which is intinlately connefted with Ailro- 

 nomy, has produced a memoir containing theoretic explana- 

 tions of a trigonometrical chart for reducing the apparent 

 diftance of the moon from the fun or a ftar, to the real dif- 

 tance, and to refolve other problems of navigation, by 

 C. Maingnon, I'lviitenant de vaiffcaii. This inemoir, and the 

 chart by which it is 'accompanied, contain an ingenious, 

 eafy, and correal method of reducing diftanccs with a fcale 

 and compafs on one chart, inftead of the great number 

 which have been puliliihed by Margets ; and the report 

 which C. Leveque has made to the Inftitutc on this fubjeft 

 diiplays great erudition, and contains important refle6lions. 



C. Leveque has publifhed alfo, in the Coiuioiff'ance dcs 

 Terns for the year 10, an intcrcfting memoir on the ufe 

 which may be made of the horary charts of Margets for 

 refolving problems, which the author had not in view, and 

 which render them more intercfting than was imagined. 



The Bibllotueque Brilaiinlque, an excellent journal, pub- 

 liflicd at Geneva, contains a li extract of fcvcral reports made 

 to the Society eftablirtied in that city for the advancement of 

 the Arts, on the going of a marine lime-keeper,, executed 

 lad year by two Genevan artills, Demole and Magnin, and 

 fubmitted by them for examination to that Stjciety, who 

 appointed a conmiiifion to follow, at the obfervatorv, the 

 going of that time-piece. 



It is in the form of a cylinder, three inches in diameter 



and 18 lines in height, and is fufpended horizontally in a 



double circle, after the manner of the uiarine conipafles. It 



P :: has 



