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1830-1839 in date 
Encke, Johann Franz in addressee 
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From:
Sir John Herschel
To:
Johann Franz Encke
Date:
[19 March 1830]
Source of text:
RS:HS 7.88 & 21.63
Summary:

Thanks for his letter, which had been forwarded to his old address. Is pleased he intends working on double stars, though 70 Ophiuchi may prove difficult. Will send some of his own readings for double stars. Like him, he is astonished at the acrimony of the attack on Thomas Young and the Nautical Almanac.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Johann Franz Encke
Date:
[25 October 1833]
Source of text:
AdWDDR Encke 49
Summary:

Hopes JE will write to JH at Cape. Responds to JE's comments on JH's method of dealing with double stars. Thanks for generous comments on JH's Prelim. Discourse.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Johann Franz Encke
Date:
[17 January 1837]
Source of text:
AdWDDR Encke 49 (C: RS:HS 25.5.5)
Summary:

Tried unsuccessfully to observe Encke's Comet; succeeded in observing Halley's Comet, which JH discusses. Mentions JH's graphical method of treating orbits of double stars, JH's plans to return to England, moon maps, and sunspots.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Johann Franz Encke
Date:
[24 March 1839]
Source of text:
AdWDDR Encke 49
Summary:

Asks JE to express JH's gratitude to the Royal Academy of Berlin for electing JH a foreign member. Discusses JE's observations of divisions in the ring of Saturn, JH's sightings of Saturn's satellites, the British Antarctic expedition, and comets.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Johann Franz Encke
Date:
[18 June 1839]
Source of text:
AdWDDR Encke 49
Summary:

Asks if JE or the Academy of Sciences wish to participate in the British plan to make worldwide magnetic observations.

Contributor:
John Herschel Project