Asks TM to measure the position of some stars that are difficult for JH to observe.
Showing 181–200 of 298 items
Asks TM to measure the position of some stars that are difficult for JH to observe.
Sends a list of additional stars to be measured for JH to use as standards.
About an anomaly in one of JH's lists of observations.
About the principles whereby the nomenclature of the constellations might be reformed.
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.