Search: Herschel, John in correspondent 
Villarceau, [A. J. F.] Yvon in correspondent 
Herschel, John in addressee 
John Herschel Project in contributor 
1840-1849 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
From:
[A. J. F.] Yvon Villarceau
To:
Sir John Herschel
Date:
[18 May 1849]
Source of text:
RS:HS 17.419
Summary:

Is sending a communication to JH for insertion in the R.A.S.M.N. Seems to be some problem with understanding YV's calculations of the orbits of double stars, so YV explains his method.

Contributor:
John Herschel Project
From:
[A. J. F.] Yvon Villarceau
To:
Sir John Herschel
Date:
[16 November 1849]
Source of text:
RS:HS 17.420
Summary:

Thanks JH for his interest in YV's work on double stars. YV sends a copy of a note on double stars published in the Académie des Sciences for consideration by the R.A.S. Raises a problem of agreement between Newtonian theory and observational data. YV feels astronomical studies in France are slowing down.

Contributor:
John Herschel Project