84 De tempore Periodico Comet a 
fic !i fupponatur tempus perihelii incidere in 1 3 Junii, 
erit pro 1 Junii longitudo cometae 11 s 27 0 et latitudo 
i° 33', quae in columna verticali fecunda allegantur; 
pro 15 autem Junii, erit longitudo I s o° et latitudo 
30' bor. quae in columna verticali prima afferuntur. 
Fundamentum autem cui conftructio hujus tabulae inni- 
titur, in eo pofitum eft, quod fuppofuerim cometam li 
incolis telluris confpicuus evadat, non multo magis a 
terra debere effe remotum, ac erat dum anno 1770 menfe 
Oftobris confpicuus effe debit, bincque etiam loca in 
tabula noftra afterifcis notata indicant, dubium effe, an 
cometa in his locis vihbilis fiat. 
IN a pamphlet of eighteen pages in quarto, published 
at Upfal in 1776, Mr. eric pros per in, member of the 
Royal Academies of Sciences at Stockholm and Upfal, and 
Aftronomer to the king of Sweden, has fhewn by his 
calculations, that the obfervations of near four months 
made on this comet by M. messier could not be repre- 
fented by a parabolic orbit ; and founds a ftrong conjec- 
ture thereon, and on the circumftances of the different 
parabolas which he found neceffary to reprefent the mo- 
tion of the comet at different periods of time during its 
4 appearance, 
