<' ^58 ) 
fame of the other B, alfo^ tho* I don’t remember that I 
diredly obferv’d that. 
The Parhelia A, B, therefore, which were but a 
little dihant from the Circumference of the Halo, began 
now to appear with narrow, pale, whitifli Streaks of 
Light, in the nature of Tails, proceeding from them,* 
but foon extended themfelves fo far, that they met in 
the Point oppofite to the Sun, and form’d the Great 
Circle, A BC D, parallel to the Horizon, whofe Breadth 
was about half that of the Halo. 
Upon viewing it carefully all round, I foon difcover’d 
a third Mock-Sun, C, of a plain whitilh Light, with- 
out any mixture of Colours, (which was alfo the Cafe 
of the w'hole great Circle,) and prefently alfo a fourth, 
D, both of them pretty exadly refembling each other, 
fas the two firll: did themfelves likewife,) very much 
inferior to the Parhelia A, B, in Brightnefs, tho’ not 
fo much in magnitude ; for I eflimatc their Diameters 
to have been* to the tw’o firft Parhelia^ as 4 to 5. 
As I had no opportunity of meafuring the feveral 
Angles, I have plac’d the Mock-Suns, C, D, in the 
Scheme, rather in Agreement with former Obfervati- 
ons, than my own Guefles,* for they appear’d to me to 
be at a greater diftance from each other, and nearer 
refpedively to the two firft Parhelia^ which Difference 
M. Huygens attributes to the different Altitude of the 
Sun. 
The Arch, NVT, not being very vifible while the 
Great Circle w’as, and indeed notextending it felf at 
any time near fo far as to the Parhelia, or the Circum- 
lerence of the great Circle, I could not determine by . 
a direc 5 t Obfervation, whether the Parhelia A, B, 
appear’d in the Incerfedion ol that Circle produc’d, 
vviththe great Circle ; but the Curvature appear’d to 
me (o plainly different from that, its Center not being, 
I reckon. 
