From:
Sir John Herschel
To:
Robert Main
Date:
[19 September 1868]
Source of text:
RS:HS 24.227
Summary:
Thanks RM for the double star observations he has sent.
Contributor:
John Herschel Project
Showing 1–7 of 7 items
Thanks RM for the double star observations he has sent.
Comments on double star observations and some papers on the subject.
Sends RM a copy of Angelo Secchi's double star observations pointing to a very large number of calculation errors.
About the location of several different sets of double star observations.
Comments on the quality of some of the double star observations in print.
Seems to JH to be some systematic error in some of RM's observations; JH includes examples.
Notes strengths and weakness of heliometer for observing double stars. Calls it 'laborious, troublesome instrument.'