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Villarceau, [A. J. F.] Yvon in correspondent 
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1840-1849::1849::04 in date 
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From:
[A. J. F.] Yvon Villarceau
To:
Sir John Herschel
Date:
[1 April 1849]
Source of text:
RS:HS 17.418
Summary:

Asks for JH's comments on YV's specific double star observations. YV presents the mathematical method he uses to calculate double star orbits, which he had presented to the Paris Académie in 1847, but it was not published.

Contributor:
John Herschel Project