Astronomy.

197

se;

r mt

'Steel

S,

'vh^^' amete r

in Plate XII. The Comet repre-m this Machine is that which ap-peared

and Moon

; and thereforeflie will appear

er s of the Suneon is new in that Boint

r °>n wh Utor ‘ n the Point Z to touch the Sun only;ihii( C h Cn , ce this Point is called the Ecliptic Limit , in-1 as n is impossible there should happen a NewSirf s'^t between this and the Node D (on}' Q Us ee p without eclipsing the Sun less or more; asth e e -P artial Eclipse at K, and the 'Total Eclipse

a t we have hitherto said has been with regard

a? th e Pi

J'pej,. ^ - Æn o?nena of an Eclipse of the Sun as theyf nith tV, 2 ^P ei ^ ator on the Earth’s Surface, in whose^oon then is, and where there is no Re-fute th°A^ ter t ^ le true ^^titude of the Moon : Butf ^ Cel 1cuJ 2 •s° on as any Latitude, there the Process^ito Appearances of a Solar Eclipse will beth e IVr 1 m ,° re complex, on Account of the Variation^tudp° 0n ' S Latitude and Longitude for every differentl 5. f? an< ^ consequently every Moment of the Eclipse,tftaft- ut that I may give a clear Idea of this Affair oflQ ns, let A B D be the Surface of the Earth, M

S the Sun, seen from the Centre of the

th e > ■

/ioojj ln the fame Point of the Heavens with thea > i'n^A consequently centrally eclipsed to a SpectatorjS tvh e W ” ose Zenith the Moon is: But to a Spectator- re else situated, the fame Phænomenoti will notH? e ^3tf\ n ^ ame Circumstances, if at all. Thus aat ® will view the Moon in the Direction ofJ ■ flea 1 ^' ne B M N, and so her apparent Place inj ’t'b w?, ns he at N, where it is evident her upper‘[d so J-p l,t touch the lower Limb of the Sun,a tre ^ not eclipse it at all : But to a Spectator any

N'V/ DetWeen -

»Upsed less

B and C the.Sun will appear to beor more, as you ^o from B to-

ts. T

Or yE Atch S N in the Heavens is called the Pa-

■ ffcrence between the true and apparent Place.

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pi.lnl

F‘g- i.