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From:
Sir John Herschel
To:
'Chairman of the Eclipse Committee of the Royal Society'
Date:
[13 June 1870]
Source of text:
RS MC.9.96
Summary:

Cannot attend Eclipse Committee meeting but suggests that an observer carefully look for planets interior to Mercury's orbit, which would, if existing, reach conjunction during total solar eclipses.

Contributor:
John Herschel Project