Jeffersonian Republican. [volume] (Stroudsburg, Pa.) 1840-1853, 1843-09-28

1HS SiOaseSs uuhoet oi ectpSeS tnat can haU
pen in one year is seven; this, how
very rare, six being the greatest number. Th
least number Of eclipses tha, can happen in -
course of one year is two,-consequeniIy boz
Of tho sun-when six, four Of the sun and tn
Of the moon, and sometimes three of the sun
and three of the moon. When seven, FIVE W,
be Of the sun and two of the moon--yes Ii.
four, two of the sun and two of the moon
The year 1914 will have two visible eclipse.
one of the sun, and the other of the moon. Tba
of the sun will happen about sunset, Decembe
9th, and the other will take place The 24rh ds1
of November, at eleven and half minutes pl,
seven o'clock in the evening. This eclipse Il
of the moon, and this being the time of i !
creates, observation at Boston, for which M
rdian it was calculated. Four equations ar
necessary TO be made use of in calcuanI
eclipses, either Of the sun or moon. in order Il
reduce The mean TO true syzygy The differ
ence Of lime, in this case, between the mea
and lrne syzygy, is four hours and lbirtee
minutes-ihe Time Of true syzygy being hefor
the time OF mean syzygy. The mean syzyg \
never agrees with the true, except when 10
anomalies OF the sun and moon are either uo
thing or six signs, and The sun is then in COZ
junction with one Of the moons nodes but lI.r !
does not take place twice in thousand year,
Equations must necessarily be used in 6ndIn,
the true syzygy, because The orbits Of the su,
and moon, and in fact those Of the other plan
cts, are not circles, but eclipses and henc.
The sun aud moon are continually changing the :.
distances from the earth. Consequently II =,
UNEQUAL motion Of the sun and moon. is ii.
reason their mean and true places differ; a.
the same reason, the tims Of true syzygy differ,
from the times OF mean syzygy the sun i, cor.
sidered a moving body in calculating eclipse,
The first equation then between mean and true
syzygy, is caused by The suns unequal motion
Tho second is caused by the unequal motion Of
the moon in her eccentric orbit-the third is
caused or depends on the difference between
the sun and moons anomaly, at greatest il is4
minutes, So seconds. The fourth and I4s
equation from mean to true syZygy, depends on
The suns distance from the moons ascendar
node al the time, al greatest il is minute, 81
seconds. II is necessary in calculating an
eclipse Of the moon, 10 find the following es.
menis for any place IL. The time of orb,
full moon at The place; @ The semidlame'e-
Of the earth's shadow at the moon; I'll,
moons latitude H. The moons semidiameier;
5. The moons hourly motion from The sun.
The elements Of the eclipse which is to ia,s
place on The evening of the oath day of No.
vember, 1914, are as follows The time IF
orbit syzygy is the 24lh dav, a, 7 o'clock, Il
minutes and % seconds--ihe semdiameier o.!
The earIh's shadow at the moon is 3S' 23'-
moons latitude IS 81" south descending
moons semidiameler IA Sc. and the mOoa,
hourly motion from the sun 27' 40" Tho
eclipse begins lhirty-eght and a half minute,
before six o'clock, and ends one minute af,r
nine, and duration Of the eclipse three hpup
and forIv-one minutes.
This same eclipse will return in the yea
1862, and again in 1881, and il will appear
again in 1893. and so on. moving iIile further
TO the north or south as the case may be, oil
in process of lime it will leave The earth al ono
of the poles. When that event takes place,
there will be no return of it in less than twelve
thousand FIVE hundred years. Every eclipse
travels in expansum, quite clear Of the eaua
during this time, and at The close Of this PeFloi
of time, it returns again upon the earth al ore
Of the poles. and at each return. from yeai
wear moves liitle TO the north or south, as tie
case may be, for about fourteen hundred year,
when il leaves The earth at The opposite Poe
| from where il entered.
The moon. during this total eclipse Of 1874.
will pass through the earth's shadow, llu'
over one quarter of degree south ofiIs cent?
and consequently will be total eclipse. WhH
the lmoon passes through the centre of h
earth's shadow, she is directly opposite TO ID
sun; tha, is, the earth is directly between tn
sun and moon.
Thus we see that in the heavens ii is all re!
ulariiy and harmony. In the heavens ii IS, th'
God has chiefly manifested his greatness an
power. Here il is, that all the innumera5I
hosts Of celestial orbs roll their mighty ROUNDS
and in this all is magni6cence, proportion. an
regularity. The wan, Of space prevents q
from pursuing the subject further.
/ Wesifall, Sept. IL, lS43. II. Y. NJ
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