“on the Planet Mars! | 267 
which happened in the tite the planet paffed from one’ place » 
to the other, ‘is a plain indication of its having gone through ” 
the node of the axis. Next, we may alfo conclude, thatthe . 
node mutt be confiderably nearer the latter point of the ecliptic : 
than the formet ; for, whatever be the inclindtion of the axis, ° 
it will be feen under equal’ angles at equal diftances _ the « 
node. tee , oes 
But, by a trizonometrical procefs of folvinga few triangles, 
we foon difcover both the inclination of ‘the’axis, and the plaéé » 
where it interfects the ecliptic at reCtangles’ (which, for want 
of a better term, I have perhaps improperly called its —_ 
Accordingly I find, by calculation} that the node is in 172 ay" 
of Pifces, the north pole of Mars: being’ directed: towards ‘that 
part of the heavens ; : and that the inclination of ‘the axis to. 
the ecliptic is 59° 42’. | Pond Oaiy 
We fhall now compare the obfervations of an earhier date’ 
with thefe principles, to’ fee how far they agiee. Some of the» 
particulars and calculations relating to them areas follow.’ ° 
GA A aE ML 
1 Times of Obiervation, [Eltimations, | ede. Toueits | Angie Q. | 2d éorred. 


Se Ome en ees | ee 
D: H. M1 D. SD. Mol De ee | 
1779, May 9 ‘12 © Ao 7 22 201414 45) +O oO 
~ May ir’a2 0 62 7p 28-. dO labi85 Ripa 20 




eee | eee 
1777, Apr. 1 SON, “63 | 6 3 34 1423 26 
i em So eee eee 
‘May the 9th, 1779, as we have feen, the angle Ae ee | 
was roughly. eftimated at 42°, and ‘May 11. at 62°. The great 
difagreement of thefe coarfe eftimations is undoubtedly owing 
to the very different fituation of the dark {pot from which they 
eVou. LXXIV,. M m ! - were" 
