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
|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
H. F. Talbot Esq F.R.A.S.
1. Halley’s Comet.
2. Right Ascension.
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.