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Herschel, John in correspondent 
Henderson, Thomas in correspondent 
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From:
Sir John Herschel
To:
Thomas Henderson
Date:
[3 June 1827]
Source of text:
NatLibScot MS.3419, f.86
Summary:

Has received TH's alterations for TH's publication. Astronomical Society's council is offering TH some volumes of Greenwich observations.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Henderson
Date:
[17 January 1829]
Source of text:
RS:HS 9.283 & 21.34
Summary:

Rejoices to hear TH is a candidate for the Professorship of Astronomy at Edinburgh University. His astronomical work has been of great assistance to JH, especially his detection of the reasons for the error in the Greenwich Observations.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[13 January 1832]
Source of text:
RS:HS 9.284
Summary:

Spent a pleasant time with G. B. Airy at Cambridge. The 'Melville' ship sails from Portsmouth on Thursday and he has been promised a passage to the Cape in it. Proposes to call on him tomorrow to discuss certain things.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Henderson
Date:
[11 December 1832]
Source of text:
National Maritime Museum (draft: RS:HS 9.285 & C: RS:HS 25.13.3)
Summary:

Proposes to come to the Cape in the ensuing season and would be pleased to bring anything TH may require. Enquires about conditions at the Cape and suitable sites for JH's observations.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[5 April 1833]
Source of text:
RS:HS 9.286
Summary:

Has taken some time to consider the climate at the Cape in response to JH's request. Gives details of the climate, suitability of site for observatory, and general conditions at the Cape. There is a reasonable library at Cape Town.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[27 April 1833]
Source of text:
RS:HS 9.287
Summary:

Has resolved to leave the Cape and soon after JH receives this letter he hopes to be in England. Will bring the barometer and the exterior thermometer. Saw Dr. Duncan Stewart yesterday.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[12 August 1833]
Source of text:
RS:HS 9.288
Summary:

Has written two letters from the Cape. Arrived three days ago. Will shortly proceed to Edinburgh. Has left the barometer on the ship. Compared this barometer with the one at St. Helena.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Henderson
Date:
[15 August 1833]
Source of text:
NatLibScot MS.3134, no.51
Summary:

Arranges to meet TH, probably at Slough, and also to get a barometer from TH.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[6 September 1833]
Source of text:
RS:HS 9.289
Summary:

Proceeds to Edinburgh in the course of a few days and intends to compute the star declinations. Has some suggestions to offer before JH sails for the Cape. Would be glad to hear of the comparison of the barometer and thermometer. Left a [Thomas] Jones thermometer at the Cape.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[3 October 1833]
Source of text:
RS:HS 9.290
Summary:

Memorandum on the site of N. L. Lacaille's Observatory.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Henderson
Date:
[20 October 1833]
Source of text:
EUL:LaII425/24
Summary:

Details about JH's upcoming voyage from Portsmouth [to Cape of Good Hope] and about an expedition going north from the Cape into Central Africa.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[16 June 1834]
Source of text:
RS:HS 9.291
Summary:

Is happy to hear of his safe arrival at the Cape and comfortably housed. Comments on two stars Alpha1 and Alpha2 Centauri.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[1 August 1835]
Source of text:
RS:HS 9.292
Summary:

Received his February letter and is pleased to hear that things are progressing. No one has seen Halley's Comet yet. His work on the reduction of the Cape observations is proceeding slowly. Had no idea he gave such a poor impression of the Cape climate. David Brewster and J. D. Forbes have not visited Edinburgh recently.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[29 November 1836]
Source of text:
RS:HS 9.294
Summary:

Pleased to hear that all is progressing well with JH. Regrets the discordance in the Parramatta Right Ascensions. Observed an occultation of Gamma Virginis in April. Has seen the method of determining the nadir point of a circle. Cape reductions suffered a setback last season as he had to lecture on mathematics.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[7 April 1837]
Source of text:
RS:HS 9.295
Summary:

Sending a few lines via Captain Basil Hall. Has sent his observations of the refractions of stars at lower altitudes than 5 degrees, to the R.A.S. Started work on determining the position of the stars from Baily's zodiacal catalogue. Government has authorized the printing of the observations.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[8 September 1840]
Source of text:
TxU:H/M-0271; Reel 1087
Summary:

Activities of Mr. Jones and [J. C.] Adamson in Edinburgh. Finished reducing all stars in N. L. Lacaille's Coelum australe stelliferum, but Catalog will not be finished before B.A.A.S. meeting. Will send it in portions to Francis Baily.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[21 July 1841]
Source of text:
RS:HS 9.296
Summary:

All N. L. Lacaille's observations have been reduced and a complete catalogue sent to Francis Baily to be incorporated into the catalogue of the R.A.S. Hopes Baily is recovering his health.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[31 January 1842]
Source of text:
RS:HS 9.297
Summary:

Has received a series of observations from Thomas Maclear on Alpha1 and Alpha2 Centauri. Comments on these observations and gives results made by the old circle.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Thomas Henderson
Date:
[4 February 1842]
Source of text:
RS:HS 9.298 & 22.112
Summary:

Congratulates him on his discovery of the parallax of Alpha Centauri. Comments on this and makes suggestions for further examination.

Contributor:
John Herschel Project
From:
Thomas Henderson
To:
Sir John Herschel
Date:
[11 February 1842]
Source of text:
RS:HS 9.299
Summary:

Thanks for letter and printed address and for the favorable notice of his investigations into Alpha Centauri. Comments on these and some of his observations on other stars. Encloses a note of the position of seven circumpolar stars.

Contributor:
John Herschel Project