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1840-1849::1847::04::21 in date 
Smyth, William Henry in correspondent 
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From:
William Henry Smyth
To:
Sir John Herschel
Date:
[21 April 1847]
Source of text:
RS:HS 16.296
Summary:

Sends angular results from various astronomers using similar epoches.

Contributor:
John Herschel Project