Astronomical and Nautical Collections. 319 



earth being a spheroid, the polar axis being to the equatorial as 



320 to 321. 



Example I. 



In the first example above, the latitude is 15° 10' S., the sun's 

 declination 6° 49' S., and the moon's declination 24° 41' S. Hence 

 the moon's horizontal parallax corrected is 58' 26", with which the 

 true distance will be found to be 41° 18' 33". Table XII. gives 

 5" to be added, and Table XIII. 7" to be subtracted. The cor- 

 rected true distance is therefore 41° 18' 31". 



Log. of 7" 0-8267 



Example II. 

 In the second example above, the latitude is 41° 15' S., the star's 

 declination 10° 13' S., and the moon's declination 6° 48' N. Hence 

 the horizontal parallax corrected is 58' 41", and the calculated true 

 distance 30° 2' 1". Table XII. gives 14" to be added, and Table 

 XIII. 6" to be subtracted. The corrected true distance is there- 

 fore 30° 2' 9". 



