S6 DESCRIPTION, &c. 



the defcription and drawing it is eafy to conceive that 

 the following problems may be done by the machine. 

 I. The hour and minute of the day. 2. The hour and 

 minute of fun-rifmg and fetting in every part of the 

 world, as the places pafs in fucceffion before or behind 

 the circle of illumination. 3. The different feafons, 

 and lengths of day and night. 4. The fun's place In 

 the ecliptic and day of the month. 5. The phafes of 

 the moon ; her age, place of nodes, cclipfes, rifing, fet- 

 ting and fouthing, in every part of the world, fhewn 

 by a wire circle of lunar illumination attached to the 

 moon's axis and at right angles to the plane of her orbit ; 

 whofe interfedlion with the folar circle of illumination, 

 will fhew the height of the fun, at the rifing or fetting 

 of the moon. 



No. 



