a device serving to facilitate the calculation of spherical problems.
| 单词 | θ206010 | 
| 释义 | society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > 			[noun]		 > device for spherical calculations (2)		 spherograph1858 a device serving to facilitate the calculation of spherical problems. sphereometer1862 Nautical. (See quots.)  | 
	
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