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Schumacher, Heinrich Christian in correspondent 
Herschel, John in addressee 
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From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[17 April 1821]
Source of text:
RS:HS 15.367
Summary:

Thanks for honor conferred by Astronomical Society. Mentions [F. W.] Bessel's paper on the 4th satellite of Saturn. Calculated tables of apparent places of 45 stars, which HS plans to publish annually.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[25 June 1821]
Source of text:
RS:HS 15.368
Summary:

Sends invitation to participate in an astronomical journal. Asks JH to forward letter to [F.] Fallows at the Cape of Good Hope. Mentions [Thomas] Young's plans to travel. Requests that JH forward letters to [W. H.] Wollaston, [John] Brinkley, [David] Brewster, and [Henry] Kater. Encloses announcement of founding of Astronomische Abhandlungen and of Astronomische Nachrichten.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[5 October 1821]
Source of text:
RS:HS 15.369
Summary:

Thanks for forwarding notice on journal to [F.] Fallows. Hopes to use the longitudinal differences of English observations to improve observations.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[8 August 1823]
Source of text:
RS:HS 15.370
Summary:

[J. W. A.] Pfaff plans to publish a translation and edition of all William Herschel's papers. Requests a catalogue of those papers and permission to publish a biography of his later years.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[1823-10 or earlier]
Source of text:
RS:HS 19.10
Summary:

Please forward biography of WH and a list of WH's papers to J. W. A. Pfaff, who plans to translate William Herschel's works into German.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[22 November 1823]
Source of text:
RS:HS 15.371
Summary:

Thanks for forwarded essay on physical astronomy. Remarks about method for precisely determining the power of a telescope. Has [C. L.] Harding's celestial atlas. Wanted to dedicate book to Astronomical Society, but asks privately whether permission is necessary.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[20 January 1824]
Source of text:
RS:HS 15.372
Summary:

Will forward Astronomische Nachrichten to JH and Astronomical Society. Comments on quality of [Joseph] Fraunhofer's micrometer, which has only the wires illuminated. [C. F.] Gauss uses a theodolite to determine the angle of the telescope.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[30 March 1826]
Source of text:
RS:HS 15.373
Summary:

Announces a new step to all astronomers toward understanding the solar system due to work of [Thomas] Clausen of the Altona observatory. Clausen recognized that the comet discovered by Biela was the same as that of 1805 and 1772. HS gives details of circumstances.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[18 June 1832]
Source of text:
RS:HS 15.374
Summary:

Sends news of a cholera epidemic to help JH make his summer plans. Mentions a number of new cases from Altona, Hamburg, and Berlin. Asks JH not to spread information.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[22 June 1832]
Source of text:
RS:HS 15.375
Summary:

Sends two bottles of Claret and a box to be forwarded for [Francis] Baily.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[5 March 1835]
Source of text:
RS:HS 15.376
Summary:

[Otto] Rosenberger has calculated perturbations of Halley's Comet by the inner planets. [Wilhelm] Beer and [J. H.] Mädler have a map of the moon and have located two moving spots on Jupiter. F. W. Bessel's assistant has reduced James Bradley's observation to constants of aberration and nutation.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[9 July 1835]
Source of text:
RS:HS 15.377
Summary:

Visits F. W. Bessel in Berlin to discuss pendulum experiments. [C. A.] Steinheil invented a photometer to measure relative light of different stars.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[17 July 1838]
Source of text:
RS:HS 15.378
Summary:

Received JH's note from Belvedere Hotel. Mentions various arrangements regarding JH's European journey, including JH's planned visit to Wilhelm Olbers.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[19 July 1838]
Source of text:
RS:HS 15.379
Summary:

Unless other responsibilities interfere, HS will meet JH in Bremen.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[24 July 1838]
Source of text:
RS:HS 15.380
Summary:

In compliance with JH's request, HS did not go to Bremen to meet JH. Hopes JH will visit him in Altona and stay at his house.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[3 August 1838]
Source of text:
RS:HS 15.381
Summary:

Asks if he can publish the finding that the star in Argo is dimming in Astronomische Nachrichten. Questions whether barometric information should be in feet or yards. Asks JH about a publication that HS and [Alexander von] Humboldt are planning.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[19 January 1839]
Source of text:
RS:HS 15.382
Summary:

Forwards a request from C. F. Gauss for magnetic observations made in England.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[12 February 1839]
Source of text:
RS:HS 15.383
Summary:

Asks permission to use information from JH's letter in Astronomische Nachrichten. Believes [Alexander von] Humboldt can explain observational anomalies that JH notes.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[11 February 1840]
Source of text:
RS:HS 15.384
Summary:

Asks JH to petition King Christian VIII of Denmark to support the Altona observatory.

Contributor:
John Herschel Project
From:
Heinrich Christian Schumacher
To:
Sir John Herschel
Date:
[28 February 1840]
Source of text:
RS:HS 15.385
Summary:

Thanks JH for suggesting that the R.A.S. write to King Christian VIII, but requests that JH include his own name and mention Astronomische Nachrichten.

Contributor:
John Herschel Project