Reports in detail JH's observations of Halley's Comet as observed from the Cape of Good Hope.
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The Sir John Herschel Collection
The preparation of the print Calendar of the Correspondence of Sir John Herschel (Michael J. Crowe ed., David R. Dyck and James J. Kevin assoc. eds, Cambridge, England: Cambridge Univ. Press, 1998, viii + 828 pp) which was funded by the National Science Foundation, took ten years. It was accomplished by a team of seventeen professors, visiting scholars, graduate students, advanced undergraduates, and staff working at the University of Notre Dame.
The first online version of Calendar was created in 2009 by Dr Marvin Bolt and Steven Lucy, working at the Webster Institute of the Adler Planetarium, and it is that data that has now been reformatted for incorporation into Ɛpsilon.
Further information about Herschel, his correspondence, and the editorial method is available online here: http://historydb.adlerplanetarium.org/herschel/?p=intro
No texts of Herschel’s letters are currently available through Ɛpsilon.
Reports in detail JH's observations of Halley's Comet as observed from the Cape of Good Hope.
Reports observations of the 'remarkable' increase in magnitude of the 'nebulous' star Eta Argus.
Reports dimming of Beta Ursae Minoris since ca. 1840. States that it is a slowly variable star.
Accepts with thanks J. Henry Griesbach's drawings of solar spots. Encourages others to observe the sun. Suggests the use of photography in recording solar spots. Pledges to give the R.A.S. all JH's drawings of solar spots.
Learned that R.A.S. plans to use aplanatic lenses for solar studies. Submits set of unpublished tables by W. L. Newman [see Newman's 1845-2-18] for calculating radii of such lenses. Refers to work of this kind by Josef Fraunhofer, [G. P.] Bond, K. A. Steinheil, and C. F. Gauss.
Describes a revolving eyepiece that could protect the eye from excess light in solar observation.
Reports JH's 1842 observation of a star near Epsilon Coronae, which may be tne new variable star [T Coronae].
There having been reports of changes in the nebula around Eta Argus, JH sends the R.A.S. a letter from JH's son John [see JH's son's 1868-11-23] reporting his observations of that object. JH adds his comments.
Expresses skepticism on the claims made by F. Abbott, observing from Tasmania, of the detection of changes in the Eta Argus nebula. Compares Abbott's drawings with drawings made by JH and and by JH's son John.