10 



ASTRONOMY 



A 



[Sect, I, 



APP^ 



vs 



though it be not exactly in the meridian), and should 

 always be levelled, before commencing a series of observa- 

 tion?;. One or two stars at least, as near the pole as 

 possible, shonld be observed every night, in addition to 

 the Nautical Almanack stars necessary for chronometer- 

 error, and the moon-culminating stars which are observed 

 with the moon. The instrument should be reversed on 

 alternate nights ; and, if possible, as many transits of the 



moon should be taken after the full moon as before the 

 full moon. 



In the register of all these observations, the same rule 

 should be followed which is laid down under the first 



; that every observation should be recorded 

 unreduced., exactly in the state in which it is read from 



th 





xtant or chronometer; and that the unreduced 



observations should b 



»e a 



ccompanied with the elements of 

 reduction of whatever kind ; and that (if the navigator has 

 [)ad leisure to reduce theia) the reduced results should 



also be ^iven. 



G. B. Airy. 



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