| 单词 | meridian mark | 
| 释义 | Definition of meridian mark in English:meridian marknoun Astronomy 
 OriginMid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer. Definition of meridian mark in US English:meridian marknoun Astronomy 
 OriginMid 19th century; earliest use found in John Herschel (1792–1871), mathematician and astronomer.  | 
	
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