Sending some equipment back and forth, and some astrometer readings.
Showing 41–60 of 134 items
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.
Urges against carrying up Table Mountain the zenith sector sent to TM to check N. L. Lacaille's measurement of a degree of terrestrial longitude. Comments on JH's skill with precision instruments.
Final arrangements before JH and family depart for England.
Having read John Burrow's book, JH proposes procedure for analyzing masses of data from [African] Expedition. Will volunteer to interpolate chronometer errors if TM will undertake computations.