Observing Sessions

Observing using the telescope

Observing evenings are held twice a month Friday and Saturday The evenings are planned for two nights but we meet on only one of them.
In order to give us the best chance of observing under a clear sky we aim to meet on the first date, but if it's cloudy we meet on the following night and so on.
The dates of the sessions are published in the CAS Newsletter and here on the website shown below.


Observatory Session 2016 - 2017

Date Day Time Venue Status
Phone 07535718669
3rd or 4th March Friday or Saturday 20 - 00 - 00 - 00 Dyffryn Gardens Tonights observing session Sat. March 4th is cancelled.
24th or 25th March Friday or Saturday 20 - 00 - 00 - 00 Dyffryn Gardens Phone above number to see if session will go ahead
21st or 22nd April Friday or Saturday 20.30 - 00 - 00 - 00 Dyffryn Gardens Phone above number to see if session will go ahead
28th or 29th April Friday or Saturday 20.30 - 00 - 00 Dyffryn Gardens Phone above number to see if session will go ahead
19th or 20th May Friday or Saturday 21 - 00 - 00 - 00 Dyffryn Gardens Phone above number to see if session will go ahead
26th or 27th May Friday or Saturday 21 - 00 - 00 - 00 Dyffryn Gardens Phone above number to see if session will go ahead

Members of the public are welcome. Come and see the wonders of the Universe through our telescopes and talk to knowledgeable astronomers. It's a whole new experience just waiting for you to explore!

When do they take place?

Observing evenings are held twice a month. The evenings are planned for two nights but we meet on only one of them.
In order to give us the best chance of observing under a clear sky we aim to meet on the first date, but if it's cloudy we meet on the following night and so on.

The dates of the sessions are published in the CAS Newsletter and here on the website and are generally planned around the weekend.

Where do they take place?

At the moment our observing nights are held at Dyffryn Gardens observatory. You can find a map and directions by clicking here or on any venue.

How do I know if the session is on or not?

Generally, if it's completely cloudy then the session will not be on. Check below in the Status column of Upcoming Sessions section (The Date, Time, Location and Status of the next session are shown above or phone the CAS Observing line, on 07535718669, for the latest information for the next session.

Do I need to have a telescope to come to an observing evening?

No. We always stress that you don't need a telescope to look at the night sky and we have a small supply of binoculars for attendees to borrow. Our aim is that observing evenings are a social event and a chance for people to discuss astronomy and learn from each other. If you haven't got a telescope there will be plenty of people who have got one and will be only too happy to show you. Please ask before you touch someone else's telescope. Set-ups can be different for each scope, and they may be in the middle of taking a photograph or something, even if it looks as if no-one is using the scope. If you do have a telescope but haven't had much success using it, don't be afraid to bring it along. You'd be surprised how many people struggle to find objects in their new telescope - you would not be alone. Bring it along and someone will be happy to give you advice on setting it up, and finding your way around with it.
What equipment do I need to bring?

What do I wear

The main essentials are warm clothing and perhaps a warm drink and something to eat. No matter how warm it may have been during the day and what the weather forecast says, if you are stood under a clear dark sky for several hours it will be COLD ! We don't want any hyperthermia cases on our hands. It will be dark, so you may be tempted to bring a torch. If you do, please make sure it gives out a red light. It takes about 20-30 minutes for the human eye to become 'dark adapted' for optimum night viewing. A white light will cause you (and others) to lose that dark adaption. Using a red light avoids that, while allowing you to avoid obstacles and read star charts etc. You can buy special red light torches, but just cover a standard torch with some red plastic and tape it on to get the same effect.

How long will observing sessions last?

That all depends on the weather, and perhaps most importantly how cold it is! Normally people start to drift away after 2 or 3 hours and only a few hardy souls make it past midnight. On a particularly clear night with plenty to see things may carry on into the small hours, but don't feel obliged to stay to the end if you'd rather be in bed.

I'm a complete beginner. What do I need to know before I come along?

There is no 'required level'. There will always be more experienced people who you can learn from, and you probably know more than you think anyway. It really is just a case of turning up, introducing yourself, and enjoying the view.

Etiquette for observing evenings

We don't have strict rules for observing sessions and keep things very informal. However, a few common sense points of etiquette will help things run smoothly:

  • Ask before you use someone someone else's telescope.
  • Don't shine bright lights around where people are observing.
  • If you are arriving late or leaving early, try to avoid car headlight beams shining where people are observing.
  • Do not smoke near the telescope - smoke particles damage the optics.

Safety tips

Astronomy is not a dangerous sport, but there are a few things to remember; It will be dark at the site and there will be plenty of things to trip over: telescope tripods, cables, storage boxes, carrying cases etc. Take care to avoid obstacles and try to leave space between telescope set-ups if you can. It will be cold.. Make sure you dress appropriately. If you are unsure about anything, just ask. There are plenty of people there to help.

Please note that all private equipment brought to CAS events is not insured by CAS and therefore CAS shall not be held liable for any damage or loss. The owner of the instrument is responsible for the safe and proper use at all times in accordance with manufacturer's instructions.

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