Astronomy.

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is but about 20 Degrees, and that 01 ^nus but about 47 ; which answers eJj3 {(7

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O to Z, it will appear to go in the Heavens Pto X, still the fame Way as before; and b eC fapparent Motion agrees with the true, it is all tb lSdirect. ^

18. But when the Planet moves from Z t0Ray T X will return, and describe the Arch X vj'again ; and as the Planet moves from M to R»

b

fual Ray will keep moving on from W to Q_> . Qv

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the Passage of the Planet through the Part of 1 *^

Z M R it will appear to move in the Heavens .()>’X W Q_, the fame Arch as before, but in 2Direction. jjW

19. Now because the Tangent Line or V ’^ 0 S ^1T Q_ or T X coincides as to Sense with the O ^ ^

Planet for a small Distance on each Side the thand Z, as from a to b, and from e to d; there °. jJ tl>Planet when it arrives at a will appear toTangent from a to b, during which Time itin the fame Right Line T Q_," and confequeih Xjfiflj!,fame Point Q_in the Heavens: So that in i tsfrom a to b it must appear stationary., or without 9 J jstion; and the fame is to be observed inr to d, when the Planet is in that Part of its

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20. Hence we observe, that in Mercurythe Places R, Z, and A, G, of their greatest j t jstion are those in which they are stationary■these two Points that we can at any Time fee •* gF „and it is in those Points that we fee Venus fu^h fpl^ous Morning-Star or Phosphorus at A, and such 0 sdsdid Evening-Staror Hesperus z.tG. Hencethat from the Time Venus is a Morning'^ ueiflllgreatest Elongation at A, to the Time of he sEvening Star in ^

reft in Motion :

--- - - r fr e'V

her greatest Elongation at o, 1 (" ' ‘ half the T^J 1

Consequently, _ —

being a Morning or Evening-Star she is diri&other half retrograde ,

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