The sun. [volume] (New York [N.Y.]) 1833-1916, 1901-12-15
The Great Halo Of Hcivetius Observed
BY a Cleveland Professor.
From the Cicroland Plain Dealer.

" DTV NHt 'fNuN u f'fN WV
A most remarkable meteorological obser-
walton, which will be historical. was made
in Cleveland yesterday by the Rev. Frederick
Ode bach. 5. J. professor of physics in
st. Ignatius College. The observation was
that of the great sun circle or halo OF Hevelius.
which has only been observed three times
before. and probably never go perfect.
Preceding a period OF low barometrio
pressure. halos are often noticed about the
sun. The commonest OF these halos is one
that appears at a distance OF % degrees from
the sun. An outer halo. at a distance OF
"A degrees is also occasionally noted. But
the great halo OF Hevelius. at a distance OF
20 degrees Is u great rarity. and hundreds
OF years may pass before IL l. observed again,
At times when these halos are visible. there
is also visible a parhelic circle passing through
the sun and intersecting the halos At the
points Of intersection Of the p~arhclic circle
with the halos are formed balls OF light. which
are known as mock suns. dog suns" or
sun dogs These mock suns are really
not reflections of the sun at all. but are mere
intensified points OF light at the intersections
OF two light circles. They are scientifically
kno vn a. parnena Tangent 20 the halqs
are hlso oCcAs ionally noted tangent circle
Of equal radius. These are known as con
tact circles.
very wonderful The inner circle OF % de
grees Vas complete, portions Of the ts-de-
gree circle we're distinct. and the great cir Gle
OF Heveliu- was distinct for half IL circufn-
ference. Portions of the paThelic circle
were visible, and a part OF the contact circle
81 the halo Of 40 degrees was the most brilliant
pfaaqrhsiia' or nrocs suns we're visible on tGc
2a,desree a1d ,he Oo,deY[es circle. oo.,.d
AZ such . great distance from the sun that
The whole Of she circumference can never
be visible wac ACCIDENTALLY discovered
nu sast.Fu window la lIs observatory when
be glanced from his book aud noticed q De-
culiaf luminous otcu AZ cirfna cloud as lao
uISn riandng up about dfe.n minutrs
latsT b. noted that the SUPPOSED cluud Lhd
70, moved fen ~ iormsI po'il,on Ne
ran a. tao rpuf 81 hts "bservALD where
Ito uhole sondortul s~fes Of phrnomrhs
vi H. Spppsa.ts aunrsf Tho hss,ens 10
IT, appearance Nhirh h. had -ssh from no
aludow frut udFnhash .aN ~ raasfiy
g1Ir 80 halo IL us,sIius Mthn THE ssfr
,',,uls rsriisss ct tic = Gss,ss .fi' sgA
asstlns y tbs sty hts atainhos hnsd uss-
h Nthlp The f'spisHa"ni rhl ss'u
Nrss a. raints ~ routaa 9Th M hall
t~..rtlans ~ ths pafhrln fHslt uas alsu Fisibh
insiins Lrlllei 49, doss 90 ~ g.EII .Icr
fas. sE,sl'al. aii's'isd az ais.fssfs .,
tsnlial A ~ len' 81 's,i-. 10
a. dsFss tHtl Nha glgaai' 80 80
Isdi'd usi us''s n 10 m''s 'an' 500
y 80 .lafu, lsfsss - % .sss ulsi . ails'
odarlsaa lfsi HiFfftgd ca agpl.b 80
,h. y, g. ~ &c usasi 81. iUs
s,si 80 Ilsits go sitsFHs.H
~ litg lsls II ass." sssq -
III . "a lsl z
20 Odd ~ nas d.glvs
hsm ~ 81. jose hsi a.
, - i-ls :. ~ 49,. -. 10
~ ~. =.
ss
h ~ al
fH H
80 800
go
~
fH H H
.rr. HsH afft
90
go 49, as.s@ s.is ~.
s '@"a
o.. OBJ -.
| HrEfs# #ff N. '
'-s s ss.f-- sss 80 90