470 ON THE CONSTRUCTION OF ECLIPSES OF THE SUN. 



that which is sometimes produced by omitting to diminish 

 the sun's semidiameter ; and this is usually omitted in the 

 common method of projection. If the construction is made 

 for each half hour, instead of each hour, which may be done 

 with but little additional trouble, the error arising from the 

 assumptions which have been mentioned will always fall 

 within the unavoidable error of construction. 



This method of construction is equally applicable to oc- 

 cupations of a star or planet. 



