Comments concerning Francis Baily's book on John Flamsteed.
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Comments concerning Francis Baily's book on John Flamsteed.
Calculates the location of [Halley's] comet.
Star within 20 seconds of the nucleus of the comet [Halley's].
Arranges to have tea with TM tomorrow at the Royal Observatory.
Asks TM to accompany himself and Daniel Cloetes in hunting a leopard.
Does not want to compute precessions for each individual star.
Notes a discrepancy in TM's latest observations and those of Thomas Brisbane.
Congratulates TM on the birth of his son, George.
Inquires about a star not found in TM's list of comet stars. Believes that their comet collaboration is going well.
Discusses their table of comet stars.
Wants to reset his barometer by TM's.
Compares JH's and TM's barometric readings. Criticizes Pierre Morin's work.
Setting a unit of measurement for solar radiation (the 'actine'); proposes to 'take for a unit of solar heat that which if all employed in heating a cubic inch of water exposing a horizontal surface of one square inch, to a vertical Sun during one minute would produce a dilation of one thousandth part of its volume.'
Testing whether an actinometer with a glass back is more accurate than one without.
Thanks TM for restoring JH's micrometer.
Believes that JH and TM can compile a better comet catalog together than they could separately.