OF FIXED STAES BY MOON. 23 



The non-occurrence of the occultation, from the moon's centre passing at a distance 

 from the phice greater than the moon's radius, is perceived at an early stage in the 

 graphical method. 



This method requiring the use of ordinary drawing instruments only, viz. :— straight 

 edge, scale, square, protractor, compasses, and proportional compasses, appears well 

 adapted for the use of field observers. 



