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Engelmann, Friedrich Wilhelm Rudolph in correspondent 
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From:
Sir John Herschel
To:
Friedrich Wilhelm Rudolph Engelmann
Date:
[12 December 1864]
Source of text:
RS:HS 7.131 (C: RS:HS 24.78)
Summary:

Thanks for the valuable series of measures of double stars. Regarding JH's method of calculating the orbit of a double star, which RE seems to have misunderstood.

Contributor:
John Herschel Project