A Treatise On Astronomy Theoretical And Practical volume 2

Robert Woodhouse

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Sin. 9. 88172 i sum - PZ 8 15 10. 5 sin. 9-15697 (20 added) 39. 03869 (b) 19-35208 2 log. Cos. PpZ = 19. 68661 . -. PpZ = 91 36' 30", and consequently, (see p. 742, ) the longitude of the nonagesimal = 181 36' 30".
* Five decimals are sufficient : more, such is the nature of the pro- cess, would not add to the accuracy of the result.
t The angle PpZ being nearly 90, is the reason, why it is expedient to use the second, (see p. 742, ) of the formulae, which, in the first instance, gives only hal...f the angle PpZ. For a more full explanation of this point, consult Trig. Chap. V.
5 c 750 Hence, since by the Lunar Tables the longitude of the Moon \vas 245 3l' 42". 4, K, or the Moon's distance from the nona- gesimal, (see Fig. P. 741, ) is 245 31' 42". 4 - 181 36' 30" = 63 55' 12".
(4. ) Parallax in Longitude, (see p. 743, ) log. 57' 16". 2 (P, from Tables) 3. 53608-\ log. Sin. 34 23 9 (Ji) 9. 75186s sum = Ar. Com. Cos. 3 47 58 . 7 (L D 's true lat. ) 0. 00096; 13. 28890 sin. 64 10 * (K + a) 9.

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