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Figure 1. Abell 2163, a distant cluster of galaxies, all receding from us. (Source Wikimedia Commons, originator NASA/ESA/Hubble)
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The Expanding Universe: Doppler Shift To Dark Energy

10 May 202216 September 2022 Emily Bick 0 Comments

Introduction A previous tutorial discussed how the Doppler Effect can be used to determine the velocity of an astronomical object

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Photograph by Georges Rayet of the French eclipse camp at Wha-koa, Siam, courtesy Marseille Observatory Archives.
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Historical Section Webinar – 1868 Solar Eclipse – Saturday 14th May 2022 at 2pm BST

9 May 202216 May 2022 Andy Wilson 0 Comments

Link to watch the webinar: https://youtu.be/XbD3gyQi7UY Please note the webinar is on Saturday 14th May 2022, not 24th May as

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Special General Meeting

6 May 202229 September 2022 David Arditti 0 Comments BAA

Notice is hereby given that there will be a Special General Meeting of the Association at 17:30 on Wednesday 25

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Observers Challenge – The Moon passes the Beehive

6 May 20229 May 2022 Callum Potter 0 Comments

On the night of May 7 to 8, the crescent Moon will pass close by to the splendid open cluster

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BBC Sky At Night Magazine, Telescopes Masterclass – 27 April

27 April 202229 April 2022 Callum Potter 0 Comments

Next Masterclass is: Your next telescope setup, delving deeper into stargazing and astronomy – Will GaterThursday 28 April, 7pm BST

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Stellar Winds: Givers and Takers of Life
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Recordings from our 2022 Spring Meeting

23 April 20229 May 2022 Andy Wilson 0 Comments

Recordings are now available for several lectures from our Spring Meeting at the University of Leeds on the theme of

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Artist impression of the James Webb Space Telescope. Courtesy of NASA
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Observer’s Challenge – Observe the James Webb Space Telescope

18 April 202218 April 2022 Emily Bick 0 Comments

As of mid-April, commissioning of the James Webb Space Telescope continues without significant hiccough. It is now ‘at’ the place

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A source of light waves moving to the right, relative to observers, with velocity 0.7c. The frequency is higher for observers on the right, and lower for observers on the left.
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The Doppler Effect in Astronomy

18 April 202216 September 2022 Emily Bick 0 Comments

Introduction How is it we know how fast stars and galaxies are moving towards or away from us? How can

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Observer’s Challenge – Mercury at Maximum Elongation

17 April 202216 May 2022 John Chuter 0 Comments mercury

Mercury was at Inferior Conjunction on 2nd April but has been moving eastward since then and possibly became visible after

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Nominations for BAA Trustees and Council

18 March 202222 March 2022 Callum Potter 0 Comments

Nominations for the BAA Trustees and Council are now open, and applications from all members are very welcome, and if

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