CONTENTS 
O F 
VOL. LXXX. Part I. 
I. ACCO UNT of the D'fcovery of a Sixth and Seventh 
* ^7 Satellite of the Planet Saturn ; with Remarks on the 
Confruflion of its Ring, its Atmofphere, its Rotation on an 
Axis, and its Jpheroidical Figure . By William Herfchel* 
LL.D. F. R. S. Page I 
IL Agronomical Obfervations on the Planets Vi ettus and. Mars, 
made 'with a V tew to determine the heliocentric Longitude of 
their Nodes, the annual Motion of the Nodes, and the greatejl 
Inclination of their Orbits. By Thomas Bugge, F. R. S. 
Regius Profejfor of AJlronomy at Copenhagen, Member of the 
Academies of Stockholm, Copenhagen, Manheim, and Dront- 
heim, and Correjpondent of the Academy of Sciences at Paris. 
p. 21 
III. An Account of fome luminous Arches. In a Letter from 
Mr. William Hey, F. R. S. to the Rev. Jofeph Prieftley, 
LL. D. F. R. S. P- 3 Z 
IV. Extrahl of a Letter from the Rev. F. J. H. Wollauon, 
M.A.F. R. S. (dated Sydney College, Cambridge, February 
24 , 1784 ) to the Rev. Francis Wollafton, LL.B.F.R.S+ 
containing the Obfervation of a luminous Arch. p. 43 
V. An Account of a luminous Arch. In a Letter from the Rev . 
Mr. B. Hvjtchinfou to Sir Jofeph Banks, Bart. P. R. S. 
P« 45 
VI. 
