28 A S T R N M r C A L AND 



// 



102 51 2G 



4 



Eight ascension of the mid heaven. . 1G7° S' 31 



r 



Which heing substracted from 



270°, gives <; at the pole. 

 O's semidiameter, by observation. IG 12. 125 



The obliquity of the ecliptick. 23 28 



Latitude of Cambridge, 42° 23' 28" n. re- 



42 8 37 



duced to centr. 



From these elements, we find the longitude of the nona- 

 gesimal degree, 4^ 26° 32' 44'', and altitude, 55° 49' 42", and 



Mercury's parallax in lo'ngitude from 'the Sun, 3". 333; and 



in latitude, 2". 322. 



At the time of the second external contact, viz. 1^ 17' 36" r. m. 



?• ~ r 13° 47' 33". 5 



gitud 



^ 's geocentrick longitude. 7 13 32 10. 73 



221 19 45 



y 's geocentrick latitude. 

 O's right ascension. 

 Eight ascension -of the mid heaven. 240 43 45 



Which substracted from 270°, gives < at 

 the j)ole. 



5 11. 835 



29 IG 15 



From these elements we find the longitude of the nona- 

 gesimal degree, 7^ 6° 22' 32", and altitude, 34° 15' '56", and 

 Mercury's parallax in longitude from the Sun, 0". 29 ; and in 

 latitude, 3". 416. 



At 8^^ 29' 52" A. M. the apparent time of ^'s first inter- 



nal contact, his parallax in longitude from the Sun 

 3". 323 ; and in latitude, 2". 329. 



At P 15' 44", p. M. the apparent time of ^ 's second 

 ternal contact, his parallax in lon-itude from the 

 0". 318 5 and in latitude, 3". 412. 



was 



o 



S 



For 



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