From:
Sir John Herschel
To:
Heinrich Christian Schumacher
Date:
[19 January 1839]
Source of text:
RS:HS 25.5.11
Summary:
Compares magnitudes for some specific stars and then comments more generally on that question; JH believes he will no longer be able to observe in winter in England as he is too severely afflicted by rheumatism.
Contributor:
John Herschel Project