THE RAMSDEN DIVIDING ENGINE. 



725 



acterized by the uame of a month. The month Marchesvan is the 

 eighth and Cislev the ninth. The arcs liave at their left-hand corners 

 the numbers shown. (This is a "sky aspect." A "globe asjiect" would 

 be the reverse.) 



"This remarkable fragment is sufficient to determine the following 

 table, in which the year is supposed to be divided into lU mean months: 



"To compare the longitudes of the planisphere with our own we have 

 the following table, taking the numbers of the inner circle, i. e., the 

 division of 120: 



Kama of month. 



No. of 

 month. 



Degrees. 



Degrees. 



Lonjjitude from 



same zero with 



360°, reckoned poa- 



itivelj- . 



Nisan 



Ijyar 



Sivan 



Tammuz . .. 



Ah 



Elul 



Tisri 



Marchesvan 



Cislev 



Tebet 



Sebat 



Adar 



20 



10 



120 



110 



100 



90 



80 



70 



60 



50 



40 



30 



20 



300 



330 



3C0 



30 



CO 



90 



120 



150 



180 



210 



2-10 



270 



300 



