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Archives

Noctilucent cloud over Cirencester, UK, imaged by James Weightman on 2020 July 10.

Noctilucent cloud over Britain & Western Europe, 2020

A report of the Aurora & Noctilucent Cloud Section. Director: S. Brantingham. Noctilucent cloud (NLC) forms in the mesosphere at

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Four photographs of Jupiter taken by M. L. Humason with the 200-inch Mount Palomar reflector

Jupiter in 1950 & the aftermath of a South Equatorial Belt Revival

The 37th report of the Jupiter Section. Director: J. H. Rogers. At the previous opposition of 1949 there had been

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Prof Sarah Matthews, Dr Nicholas Heavens, Prof Sanjeev Gupta, Dr David Arditti and Dorrie Giles, with the plaque remembering Walter and Annie Maunder.

From the President

A plaque for the Maunders It gave me great pleasure to represent the Association at the unveiling of an English

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Figure 2: Diagonal streaks visible in the cloud markings. Note the cloud markings change depending on which filter is used to study the planet. The observation was made on 2020 Sep 1

The 2020–’21 western elongation of Venus

A report of the Mercury & Venus Section. Director: P. G. Abel This paper covers observations of Venus made during

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Portrait of Lord Warriston

British Isles aurorae, 1560–1715, Part II: 1645–1715

This is the second of two papers in which, together, 28 previously unrecognised cases of probable aurorae seen in the

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The sodium tail of Mercury, imaged by Nick James.

Photographing the sodium tail of Mercury

Mercury’s very thin atmosphere was first detected by the Mariner 10 spacecraft back in 1974. It consists of atoms captured

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HR Lyrae: the restless slumbers of an old nova

A report of the Variable Star Section. Director: J. Shears.   We present the light curve of the old nova

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Celebrating Mary Somerville (1780–1872)

In the Journal’s Christmas Quiz, Marie-Louise Archer featured a question about the contributions to astronomy made by Mary Somerville. With

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Figure 3. Different observations arranged according to the decreasing position angle of the location along the lunar limb that is maximally tilted towards Earth. Details of the equipment used are given in the text. The peaks of Montes d’Alembert are subdivided into a northern group (red brackets) and a southern group (white brackets). North is up.

Identifying the peaks of Montes d’Alembert

The Montes d’Alembert are a chain of mountain peaks found along the western lunar limb. The individual mountains were grouped

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Figure 2. WAC image of the examined region. Note the dome Lavoisier 4, which is not prominent as in the telescopic image (Figure 1). The image is shown in cylindrical projection, removing the foreshortening.

Lunar domes near Lavoisier K

In this study, we examine four lunar domes located near the crater Lavoisier K. The large domes, termed Lavoisier 1–3,

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