The Elements of Navigation Containing the Theory And Practice With the Necessa
The Elements of Navigation Containing the Theory And Practice With the Necessa
J John Robertson
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28th. Sun's mer. Zen. Difl. Cleared of refraction and parallax, vva& 53* 36' 7h" ; and their diff. Of rt. Afc. Was 109 59' 7.^^W . Thf^n 7' 57^' is the diff. Of zen. Difts. Or the alteration in declination. Alfo 23' 40^^ and (3^" 39'' or) 54^ 45^^ are the diffs. Of decl. And rt. Afc. between the 15th and i6th days of March 1770. Nov/ 23' 40''' : f '^f : : 54' 45^^ : iW 23, 5''^ the increafe of the dif- ference of right afcenfion after the noon of the 15th nf March. Then 60" -p' 07, 8'^ 18^ 23, ...5'''r:6o \i' 44, 3'^ which is the firfldiff. Rt. Afc. When the Sun had the fame decl. As at the fccond obfervation. Here, the times of the two obfervations fall nearell the winter folftice. Then 60" 11'44, 3'^-f- 109 59^ 22, 8^''= 170 \\' "f' -, its half 85" 5^33, 5''' is the dillancc of the winter folitice from the Sun. Hence 270"*+ 85'^ 5' 33, 5'^ -hiB^ 23, 5''^=: 355" 23' 57^^ is the Sun's rt afc. On March 15th. Alfo 355 23' 57'^ 60 3^ 7, 8''^ =2 94 53^ 49, 2^^ is the rt. Afc. Of Aquil:c. 246.
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