Has installed his astrometer to help judge star magnitudes; also makes a comparison of barometric observations with those of TM.
Showing 41–60 of 161 items
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.
Has installed his astrometer to help judge star magnitudes; also makes a comparison of barometric observations with those of TM.
Has compared TM's observational measurements with those of the Brisbane catalogue, and finds TM's observations to be better; is working on a star photometer.
JH's observations of the comet [Halley's], together with comments on constellation nomenclature and stellar magnitudes.
Sending some equipment back and forth, and some astrometer readings.
Sends observations of several more standard stars, and of the comet.
Sends formulae for dealing with the apparent differences, in viewing the comet and compared star, due to the effects of parallax and refraction.
Calms TM about not having his comet observations published yet; those published so far are not of much value.
A note along with a request from Niccolo Cacciatore for some observations that JH says he cannot make.
Comments on disagreements in stellar observations and on sun spot activity; and requests observations of a specific star.
About the observation of sun spots and the second satellite of Saturn.
About a variety of observations that JH has made.
About some observations, the weather, and the difficulty of establishing tide observations, given the slowness of the Admiralty.
Sends TM his nebulae observations and drawings of what he saw.
Talks about the very hot weather, and some matters of business that JH needs to work out with TM.
About the remarkably bright variable star, Eta Argus.
Sees little benefit in trying to triangulate between stations, certainly at this time; JH's mirror polishing has been very successful.
Compares his observations for some stars with the observations of TM.
Some minor matters of astronomical business followed by an extended list of principles on which a constellation reform might be undertaken.
JH is preparing to bring his observations at the Cape to a close; has polished a mirror for TM.
On the variability of Alpha Hydrae and some other stars.