770 



Description of a Persian Astrolabe. 



[No. 118. 



which govern them by night. Their influences are expressed in gene- 

 ral terms in the margin. Their order in the drawing is, according to 

 that of Persian writing, from left to right ,and hence perhaps the fol- 

 lowing arrangement will be found more plain : — 



Trigons. Governing Planets Governing Planets 



by Day. by Night. 



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By the Hindoo distribution, the twelve signs constitute one Trigon, each of the vertical column 



constituting a side. 



The inner demi-annulus contains the lunar mansions ; they are 28 

 in number, and extend over the whole ecliptic ; each representing, 

 proximately, the space passed over by the moon in one day. Their 

 names are as follow : — 



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