, 1874-10-22
LUNA ECL|PSED.
The Moon About to Pass Through
tho Earth's Shadow.
Her Path in the Darkness.
Details Of the Phenomenon, and It's
Cause.


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.t, -: s:.....;-s1.1..;tt,,., Is ~ shou4
~ ,,,i,s,,tna n,,d Al oeconds Tho moon ,,;I, oc-
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=. r. - na.~,r a7o ,nt,c, In thc inrl
7,,s .,.a,a N a. sw !. = socttn,, of lin eart1,'a
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ulaaetef ID tno 1'4''. y. 'uo o""0o" P1'ee
"hlio tue lnlc2hesa u 'ao ou1'e tapteoo'e '1o
addition Of ono-si1tiotl part OF tho ofamotof,
which is allowed IN coIhlfutatlon. This aitow-
aucn Ia mada necoaBary By tho fact that tho
cnrfh'a ntmosphere even to distance Of moro
t, m ,,;1o. fr,n, har surf,ra ator. thn nns-
~. ~ 49, ar.,. -avo s,n,oat "a offoct;vctv =.
1.e 1,e,., - mi, MI ,...,-,;., $3.50, ~
wv oe'" eo' w..
tl1o alr Woto si"u eo'uPo'o"seo ~ NAo oA4o.Sao ~
rafract@on, which dlmlnlahco tho ofeeat1 OF TUG
shadow By ca,lang tile SUMS rays to barth aronnd
the Garth towards the a1la OF tic BhadoH.
O is tho centre OF tho shadow, aud N ID the
rort,,orn noint IN ira circumference The line to
NJ .,,.o,a.s ,,rt ~ :, ctrcat c;rc1c w},;clt ua..
- =, -, :. .,s ,,,h,. p..,t;,,,
70 .u''"b' 'Ao r ,,L ~, ,7
Luz tno'u WI p1oa 'A4A -.
wet foWafos tbe noI'uesst. nes @"Su.S' soo'4o0
among tic btafa be3nE GIeastf thau tA"t " hno
enrth. The line 4 G D j IL tile potu 0t tue
moons centre, AZ referred to tho limo L. which
Js parallel With tho equator, and about IL dcY1.
nortbwa,d from 1t.
Tie lines " G L, D L, aud the distance
II. represeut tie semidiameter OF tho moon 1T
four eoparato times during tho eclipse. When
tho moons centre is at A her eastern limb will
lust touch the western edge Of tic shadow. This
is tho beginning OF Tho eclipse. As the moons
ccntie progresses from to @ Osho will ppss grad
ually within tho eha1ow, and the thin lnne ts'a-
appears at K, on her northTcstefn ll!nb' sho
will bo completely within tho aholow whi1o her
ccntro ia naxsiug from q to D; and. on arriving
at tho latter poin,, thin crescent will Peep out
fron, the shadow at L, on tho northern limb Of
fho moon. From this point ehe will grow in tu1.
nrea t;n hor centre has reached ], when tho
touthwesteru limb will leave tho shadow, and
ehc rill bo nrain 81 Full"
Tho portion Of dotted circle, r. continued
in tho upror left hand corner OF tho diagram, is
tho exterior limit Of thc ponumbra, or partial
shadow,
| Tho boundary Of tho Bhaao8 IL not strictly y
circle, Tho distance from north to south il to
| tho distance from cast to uest Us tho enrah's
radius in lntitudo ~ deg. St ,nn ia to her eaua-
! toriai radius, The diameter N s ia about II
milca loss than the diameter L II.
''' ~ Tur nrr.n. or THE ECLIPSE