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Archives

Selenehelion: imaging the Sun & full Moon at the same time with one camera

Direct, simultaneous imaging of the full Moon rising as the Sun was setting proves that both objects can be seen

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A screenshot, with area given on the left (this is repeated in Table 1, given in the PDF of the paper), and including a diagram of the group's area on the solar disc, with the extent of the group highlighted in red on a white background with equator and north-south axis shown in black lines.

The size of the Carrington Event sunspot group

The size of the sunspot group that produced the white-light solar flare observed by Carrington and Hodgson in 1859 is

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Noctilucent cloud over Loch Lomond. The clouds appear electric blue, bright against a dark sky which graduates to an orange glow above the mountainous horizon. Waves on the Loch's surface are in the foreground.

Noctilucent cloud over Britain & Western Europe, 2023

Noctilucent cloud forms in the mesosphere at an altitude of about 83 km and appears annually in northern latitudes between

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A plot of (B-V) (x-axis) against (U-B) (y-axis), with fitted curves corresponding to the locations on the plot of cluster members (represented with scatter points). The fits decrease at low (B-V), level off in the middle, then decrease more steeply again.

A free, Excel-based application for UBVIc photometric studies of galactic open clusters

Due to their discrete brightness and uncrowded appearance, open clusters are accessible to many amateur instruments. Moreover, their photometric study

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Lunar domes near the crater Cleomedes

The Nectarian-aged Crisium basin is characterised by prolonged lunar volcanism ranging from the Imbrian age to the Eratosthenian period. In

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A rare outburst of the WZ Sge-type dwarf nova PQ Andromedae

A report of the Variable Star Section (Director: J. Shears) We present a light curve of the 2020 outburst of

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The opposition of Jupiter, 1954 – 1955

A report of the Jupiter Section (Director: J. H. Rogers) After having been invisible during the previous opposition, late in

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Harry Thornton, Leslie Rae, & the rise & fall of The Moon

Harry Thornton and Leslie Rae were the Editors of the BAA Lunar Section publication The Moon from 1953 to 1967,

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The nightside of Venus visible next to the crescent of its illuminated hemisphere; this photo was taken in infrared

The 2022 western elongation of Venus

A report of the Mercury & Venus Section (Director: P. G. Abel)   Analysis of the observations made by Section

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A photograph of the bearded Brorsen, sitting in a chair with arms folded

The tortuous discovery of the Gegenschein, false zodiacal light & zodiacal band – Brorsen vs Jones

It is routinely thought that Brorsen discovered the Gegenschein and zodiacal band in 1854. Here, it is argued that priority

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