fr

C H R O N O L O G Y. 69

ffirawn through it, according to Eudoxus, cuts the ecliptic in & .Grfiks.

6°. 5 8'. 5 7" ( 2 )r In the head of Cetus are two ftars of the fourthmagnitude, ealled v and E by Bayer: in the end of the year1689 their longitudes were 8. 4 0 . 3'. 9". and 8. 3 0 . 35^.

and their fouth latitudes 9 0 . 12'. 26^. and 5 0 . 5 3'. 7": and theGolurus JEquinocliorum paffing in the mid-way between them,cuts the ecliptic in 8. 6°. 58'. 5i // ( 3 ). In the extreme flexureof Eridanus, rightly delineated, is a ftar of the fourth magni-tude, of late referred to the breaft of Cetus, and ealled £ byBayer ( 4 ) ; it is the only ftar in Eridanus through which this Co-lure canpafs; its longitude, in the end of the year 1689, wasT. 25 0 . 22/. 10". and fouth latitude 25°. 15'. 50". and the Colu-rus JEquinoctiorum paffing through it, cuts the ecliptic in 8. 7°.

12'. 4o' / ( 5 ). In the head of Perfeus, rightly delineated, is aftar of the fourth magnitude r ealled t by Bayer; the longitudeof this ftar, in the end of the year 1689, was 8. 23°. 25'.

30" ( 6 ), and north latitude 34°. 20'. i2 // : and the Colurus Mqui-noSiiorum paffing through it, cuts the ecliptic in 8.6°. 18'.

57" ( 7 ). In the right-hand- of Perfeus, rightly delineated, is a

ftar

Let B'therefore be that middle point, and b b thecircle of latitude paffing through it, and meeting theecliptic T b in b. Draw a great circle, ba, to makean angle with the ecliptic of 66°. 30'. the acute an-gle looking wefhvard, becaufe the point b is to thefouth of the ecliptic. Then ba will be the equinoc-tial colure of the primitive fphere, and a the equi-noftial point of that fphere.

Now in the right-angled triangle bJa, zb — 7 0 . 32'. 46'' j being the latitude of b: andja b — 66°. 30'. 00

o / u

Hence I find b\ — 3 18 7

But Tb — 33 35 22

Therefore ta r 36 53 29

Raper’s copy has b. 6 53 42 written in his haud in the margin.

( 4 ) This is the ^ Ceti, in quadrilatero peclorispraecedentis lateris borea , of the Britannic Catalogue.

t 5 ) In 8 . 7 0 . 12'. 38". by my calculations.

Let b in the laft figure reprefent the place of 5 Ceti.

Then

zb

= -5

'5

and

BA b

- 66

30

00

Hence I find

bA

“ 11

5 °

28

But

T b

- -5

22

10

Therefore

Y A

- 37

12

38

(?) Read y .

23 0 . 3S ;

30".

See

Flarrilted. Cat. Brit.

B

< 7 ) In 8.6°. iS'. 48".

Let