An astronomical instrument originally devised for measuring the diameter of the sun; now much used in determining the angular distance between two…
| 单词 | θ1435 | 
| 释义 | the world > the universe > cosmology > science of observation > astronomical instruments > distance between bodies > 			[noun]		 (1)		 heliometer1754 An astronomical instrument originally devised for measuring the diameter of the sun; now much used in determining the angular distance between two… | 
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