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Archives

Occultation of 44 Cap by the Jovian satellite Io on 2021 April 2

The occultation of the star 44 Capricorni (44 Cap) by Io on 2021 April 2 was imaged from Curaçao. Occasional

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The 2018 opposition of Mars & the global dust storm : Part 1

The perihelic opposition that occurred on 2018 Jul 27 at areocentric longitude (Ls) 219° was monitored by 121 observers, yielding

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The brighter comets of 2018

This report describes and analyses observations of the brighter or more interesting comets at perihelion during 2018, concentrating on those

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Six remarkable northerly novae in 2020–’21

During late 2020 and 2021, six relatively bright novae appeared in the northern celestial hemisphere. The light curves of V1391

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ζ Herculis: a case study in the magnitude differences

Two slightly novel methods of visual observation in small telescopes of close, very unequal double stars are presented here and

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Visibility times of Martian afternoon clouds

This paper reports local times when afternoon clouds become telescopically visible for several locations on Mars. With the exception of

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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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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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