1783, 
on the Planet Mars. | 265 
Ok. 9. 10h. 47's The flattening at the poles very vifible. 
O&. 10. gh. 55’. A little of the polar flattening is vi- 
fible, fo as to admit of no doubt; power 460, very 
difting. | | 
rth. 32’. Mars vifibly flattened, but not much; the 
achromatic fhews it alfo. | 
ith, 42’. The difk of Mars is vifibly {pheroidical. 
O&. 11. 7h. 37’. Mars is plainly gibbous, therefore 
meafures and eftimations ef the diameters muft for 
the future be improper. 
11h. 12’. It is rather difficult to fay of what fhape 
Mars is now, for itis partly flattened and partly gib- 
bous; but the gibbous fide not being quite in the 
polar dire€tion of Mars, this produces altogether an. 
odd mixture of fhapes: however, upon the whole, 
the polar diameter is full rather the {malleit. 
11h. 13’. The preceding fide of Mars thews the flat- 
tening of the poles, while the followimg is termi- 
nated by an eluptical, arch. 
O&. 12. 11h. 12’. The flattening upon the shale is 
vifible. 
O&. 17. 13h. 7’. The effect of gibbofity is {carcely 
equal to the flattening; or, upon the whole, the 
planet is full rather broader over the equator than 
over the poles. 
Nov. 1. 7h. 56’. The femi-difk, which 3 is full, is evi- 
dently part of an oblate fpheroid ; but, to an eye not. 
attentively looking for it, and knowing the fhape and 
exact fituation of the poles of Mars, this would 
probably not appear. 
‘Vor. LXXIV. | Nn ‘i 1783, 
