112 CORRECTIONS TO BE APPLIED TO THE PARALLAX OF THE MOON. [18 



The constant employed in the computations of the American Nautical 

 Almanac does not appear to be mentioned in the Preface. It may, how- 

 ever, be determined in the following manner : 



The sum of the daily corrections given in the above table is 370"'4. 

 Now, I find that 14"'l of this is due to the corrections applied to the 

 periodic terms, leaving 356" - 3 as the effect caused by the difference of 

 the constants. This, divided by 365, gives 0"'98 as the correction to be 

 applied to the constant of the American Nautical Almanac, in order to 

 make it agree with my own. Hence, this latter value being 3422"'32, it 

 follows that the constant employed in the above work is 3423"'30. 



