| Halos. ; gu 297 3 
_. Demonstration. These numbers are half of the corresponding 
vasgaail in the column [C]. The expression for them, is there- 
. 2 
| — 5) Sy which is ae of the two squares = and 
ap , 
Arr. XII. iene: —1. Sonar. 
Some account : an psttewnrphertc Planionitetin, seen a few years 
| since, in the County of Otsego. (From a agai’ read soefors the 
Albany Lyceum.)* 
~ Communicated by 8. DeWirr Biooncgoop, Esq. 
On the morning of the 7th of February, 1823, a very brilliant 
n, or halo, round the sun, with anthelia, or mock suns, in the - 
ference of the circle, was observed by many persons in the s5e 
. county of Otsego. The writer, in company with some gentlemen 
of this city, (Albany) was travelling in the town of Decatur, on the 
Toad to Cherry Valley, when, at about 8 o’ ’clock in the morning of 
that day, the phenomenon alluded to, was distinctly visible on the 
Tight hand side of the road. A large and brilliant circle surrounded 
the sun, and at the extremities of the horizontal diameter were two 
mock suns, very bright, with conical tails, opposite the true sun in 
the center. ‘The day was cold and stormy, and the air was filled 
; with dry and shining particles of snow which ‘apparently hung over 
; the brow of the hill, upon which the road ran. . The sun had gained 
20 degrees of altitude. ‘The wind was due West, and the halo was 
very large. It is impossible. at this time to ascertain its size, but it 
appeared to be of great magnitude, and very near the spectator. It 
lasted about ten minutes, and then vanished. The weather for ~ 
two or three following days was cold and storm 
_ The writer of the above statement regards the explaniianel sida 
to given of such phenomena, as not altogether satisfactory, or rather, 
that of some of them no real explanation has been given. Water 
ee oe 
$i + 
* nee 7 2 . . . 
The explanatory remarks are abridged from a manuscript communication to the 
Editor 
