Stargazing with Dark Skies Wales at Brecon Beacons Mountain Visitor Centre from 7.00-10.00 p.m. on Friday, 18th October 2019

CAS will be repeating the successful event it held last year with Dark Sky Wales but tickets are selling fast - see here.

The latest Sky at Night podcast features one of our own!

The September 2019 Sky at Night podcast is available now and features (from just over 18 minutes in) our very own Katrin Raynor-Evans (CAS Publications Officer and Librarian) who gives advice about getting ready for the new astronomy season next month (when the evening skies will of course be getting darker earlier) and on how to carry out maintenance of your equipment. Katrin - pictured opposite at a recent event at the National Museum Cardiff - also provides her top tips for keeping warm when out observing on those cold nights to ensure your enthusiasm doesn't dwindle!

Listen to the podcast here


>Next Talk

Thursday, 17th October 2019 at 7.30 p.m. "Grey Mars; The World Beneath the Red Dust" to be given by Lucy Kissick. PhD student - University of Oxford. Our talks - which finish no later than 9.30 p.m. - are usually held in Room T2.09 (the Trevithick Lecture Theatre) at the School of Physics and Astronomy, Cardiff University, The Queen's Buildings, The Parade, Cardiff CF24 3AA - please click here

The talk: Mars today is colder than Antarctica and drier than the Sahara — but scratch beneath its dusty-red coating and tales of a different planet emerge. The young Mars of three billion years ago was an Earth-like place of rain, rivers, and perhaps even oceans. In this talk, I will outline how we know this and how my research is trying to pin down how it all went wrong — through the relentless erosion of the Martian atmosphere.

Lucy Kissick is a PhD student at the University of Oxford researching ancient Martian lakes and how they once interacted with the planet's atmosphere. She trained as a geographer at Durham University for her undergraduation, specialising in understanding the Martian surface from orbit, and writes science fiction in her spare time.

>Next Star Party

Friday, 25th October 2019 from 7.30 p.m. until 9.30 p.m at Dyffryn Gardens - please click here

Enquiries about this Star Party should be made to Kath Compton, the Society's Membership Secretary, at

>Next Observing Session

Friday, 25th October or Saturday, 26th October 2019 from 8.00 p.m. until midnight at Dyffryn Gardens. Further details are available here


Introduction to CAS

The Cardiff Astronomical Society (CAS) is a thriving society located in South East Wales. It has been in existence for over 40 years and is one of the largest amateur astronomical societies in the UK. CAS provides a range of facilities for both Society members and the public at large including a varied programme of talks on Thursday evenings (except in August) at the Physics and Astronomy Department of Cardiff University. In addition, regular night sky (and occasional solar) Observing Sessions are held at the Society's own Observatory at Dyffryn Gardens.

Our members come from all walks of life and their knowledge of astronomy ranges from complete beginner to advanced. You don't need any specialist knowledge to join us and neither do you need to own a telescope or binoculars. It's also possible to try us out before joining!

More details about the Society and what it does are available here

We are keen to get more Society members on board to assist with the running of CAS events - please see here how you can Help Us

Society help for schools etc

As shown here, Cardiff Astronomical Society welcomes all invitations from organisations such as colleges, schools and guide/scout/brownie groups located in Cardiff and surrounding areas for an outreach stargazing/astronomical event for all ages and levels of knowledge. Society members very much enjoy bringing our passion for the subject to a wider audience and helping everyone to get started in this fascinating subject. We do not charge a fee for our expertise and participation; the enjoyment is enough reward and we will do our very best to ensure a worthwhile and enthralling evening. We would, however, be grateful for reimbursement of travelling expenses and petrol costs to venues outside of Cardiff and its environs. Otherwise the cost would fall on individuals and the non-profit-making Society. It should be noted that CAS has a formal Policy on Child Protection and the Protection of Vulnerable Adults


Catch the very latest astronomy news from

Day-by-day guide to this month's night sky

A beginner's guide to astronomy

The Exmoor Dark Skies Festival runs from Monday, 14th October to Sunday, 3rd November 2019

There will be events taking place at venues all over Exmoor, from stargazing talks and sessions to night time adventures in an area with some of the darkest skies in the country. Events include Guided Night Walks, Family Astro Party, Night Mountain Biking, Stargazing Talks, Wildlife at Night, Planetarium sessions and more. Further details are available here. And here's a possible place to stay!


Join the Society

Come and join some of the Society's 275 members at one of our talks or observing events. We promise a warm and friendly welcome for all. Only £15.00 per annum also means you can make use of our Library

Gift Aid

CAS is registered for Gift Aid. This means that, if you are a UK taxpayer, we can claim back the standard rate tax on subscriptions (and on any donations) paid since the Society became a registered charity on 31st October 2016 (giving an effective 25% boost to the amount the Society has received). However, in order to reclaim these monies from HMRC, we need all members who pay tax to complete and sign a Gift Aid Declaration form. Please note that if you have paid your subscriptions by PayPal, you will have already been asked if you would consent to those subscriptions being Gift Aided - but we still need a completed and signed Gift Aid Declaration form in order for us to reclaim the tax paid as Gift Aid.

If you are eligible, please take a form (using the button opposite) and then complete & sign it and pass it to us at one of the fortnightly talks or send it to CAS by post or email (see the bottom of the form). Thank you for your help!

Support CAS when shopping online

If you chose to do so, every time you shop online via 'easyfundraising' at one of 2,700 retailers (including AmazonSmile, John Lewis, Next and Argos) a donation will be made to the Society and it won't cost you a penny extra. It's really simple to get started but please click here for more information including an important tip.