| 词汇 | 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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