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Public talks

The Society holds public talks about astronomy at Trinity School, Croydon CR9 7AT approximately every other Thursday during school term time. Our talks are open to all. 


The talks are usually held in the Staff Canteen – see Talks location below for directions.  Very occasionally the school may ask us to use another room and, if this is the case, details of the alternative room will be posted on this page. 


Talks start at 7.30pm sharp and usually finish by 9pm including a break for refreshments. There is no charge but we suggest a donation of £3 per person towards society funds (larger donations are, of course, very welcome).  Refreshments (tea & coffee) are available for a nominal charge of 50p.  We accept cash and contactless (minimum £1) payments

2023 Talks programme

Welcome to our Spring 2024 Programme.

Dates for 2024

Spring term

January 11th.

Our Chairman Tony opens the season with a talk entitled "The Great Equatorial".

After a brief history of the founding of the Royal Observatory Greenwich he looks at why the Observatory decided it needed to have a large refracting telescope and then replace it with an even larger one only 40 years later.

January 25th.

A night of Short Talks:

Roy Easto - Mirrors.

Alan Drummond - Edwin Hubble.

Tony Roberts - Telescope mounts, a basic guide.

February 8th

You may remember the spectacular images of rainbow coloured clouds that were in the press earlier this year. Tonight's talk is about these "Polar Stratospheric Clouds"

Also known as Nacreous Clouds we tonight welcome Prof' David Rees to speak about them.

Prof' Rees was Professor of Atmospheric Physics at UCL for thirty years and now divides his time between LIDAR observations of the atmosphere and build instrumentation of the next generation of satellites for ESA.

February 22nd

Tonight we welcome back James Fradgley who will speak on "Rodinia and the boring billion",

a look at how life developed on Earth and what we can learn from this when looking for life on exoplanets.

March 7th.

"If Venus had a Moon" is the title of tonight's talk from well known speaker Greg Smye-Rumsby.

Greg is a specialist planetarium presenter for the Royal Observatory Greenwich and produces diagrams and celestial maps for Astronomy Now magazine as well as writing articles for them.

 March 21st.

A welcome back to an old friend of the Society and past lecturer at the Old Royal Observatory Greenwich, Tony Sizer. Tonight he will talk about

"Atoms, photons and the Nebulium Affair".

Hear about the start of astronomical spectroscopy and the first person to conduct systematic spectroscopic observations, Sir William Huggins.


Summer term

April 18th.

"A journey to reach the Stratosphere"

From Croydon High School we welcome Arabi Karteepan.

Arabi is the Head of Physics at Croydon High and this years winner of the Royal Astronomical Society Secondary Education Award. Tonight we will hear how her group, called Astrogazers, successfully launched high altitude balloons which touched the edge of space and their plans for later this year.

May 2nd.


May 16th.

Tonight we have an introduction to Radio Astronomy in its many forms.

Our speaker tonight is Andrew Thomas. He is a board member of UK Radio Astronomy Association, like the CAS a Charitable Incorporated Organisation, which is set up to promote Radio Astronomy by providing the equipment to carry out radio observations and provides the standard equipment for the BAA Radio Astronomy Section. Come and find out about a branch of astronomy you can do in the warm and regardless of the British weather!

June 6th and 20th,

July 4th.

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Talks location

Trinity School, Shirley Road, Croydon CR9 7AT

Trinity map 2.png

If driving, enter the school from the Addiscombe Road A232 and follow the one way road, turning right at the mini roundabout by the exit onto Shirley Road.

Parking is in the staff car park on the left opposite the main entrance to the school.

The Sandison Room is just behind reception.

Directions to our meeting room from the Addiscombe Road entrance.


Enter via Addiscombe Road.  The gates should be open but members will be sent the entry code by email.


You pass the "Boys Entrance" on the right.  Keep going to the mini roundabout.


Drive in and soon turn left, signposted "Trinity School Reception"


At the mini roundabout the exit is on the left.  Don't go left, go right at the roundabout.


Keep going towards "Exit".


Drive on to the sign for Reception (by the flagpole).  Parking is in the staff car park to the left, reception is on the right.


Walk up the steps to Reception.

Once you are in Reception see this map for route to the Staff Canteen where we meet

Hint: to get in through the reception doors you may have to ring the bell.  If you get stuck in reception go back out and ring the bell again to speak to the Porters.

Directions by bus

These buses stop outside and all of them connect with East Croydon Railway Station and tram stop.


119: Croydon Airport to Bromley

194: West Croydon to Lower Sydenham

198: Shrublands to Thornton Heath

466: Caterham-on-the-Hill to Addington Village


If coming from East Croydon get off at stop F (Trinity School).  If coming the other way than you need stop P.


Trinity School is approximately 10 minutes on foot from the Sandilands tram stop.

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