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Document number: 03113
Date: 07 Aug 1835
Recipient: TALBOT William Henry Fox
Author: DE MORGAN Augustus
Collection: British Library, London, Manuscripts - Fox Talbot Collection
Collection number historic: LA35-18
Last updated: 19th May 2015


In reply to your note of the 6th inst. I beg to acquaint you that in the only Ephemeris of the Comet<1> I can now lay my hands on, the places are not give [sic] for the 10th, 20th, or 30th, instant. The nearest to these days are as follows, or rather the following are the places for 4 equidistant periods of fo eight days

R.A.<2> Dec.<3> Meridian Passage (Greenwich)
Aug 11 5h 31m·43 23º 22º·2 20h 12” 12 mins
19 5 38 ·72 24 14 ·3 19 48
27 5 46 ·62 25 21 ·1 19 24 10½ mins
Sept 4 5 55 ·80 26 53 ·7 19 2

The above is taken from the Nautical Almanac for 1835<4> where further information will be found

The appearance of the comet will most probably be notified in the newspapers before it reaches the Society.<5>

I remain Sir Your obedt Servt
A De Morgan

Somerset House
August 7/35

[address panel:]
H. F. Talbot Esq F.R.A.S.
Lacock Abbey
near Chippenham


1. Halley’s Comet.

2. Right Ascension.

3. Declination.

4. Nautical Almanac for Astronomical Ephemera (London: The Lord’s Commissioners of the Admiralty, 1833), p. 489.

5. De Morgan was Vice President of the Royal Astronomical Society, then based at Somerset House, London.