The Dyffryn Observatory is located on the grounds of Dyffryn Gardens and is the proud home of Cardiff Astronomical Society.
The venue is away from the worst effects of light pollution and benefits from excellent dark skies, allowing visitors to observe fantastic astronomical objects using the large 11″ aperture telescope.
The group regularly open their observatory to the public for stargazing sessions and star parties.
Location events organiser
Cardiff Astronomical Society organises events at this location
Please contact Cardiff Astronomical Society directly with any enquiries relating to visiting this location
Email: [email protected]
Website: Cardiff Astronomical Society
Twitter: @cardiffas
Facebook: Cardiff Astronomical Society
Weather forecast
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16/09/25
15° 55% -
16/09/25
14° 92% -
17/09/25
14° 96% -
17/09/25
14° 98%
Weather forecast for Dyffryn House Gardens (1.1 miles away) updated 16/09/25 at 20:02.
Local light pollution
Dyffryn Observatory is estimated to have light pollution levels similar to a semi-rural location based on the latest data from the VIIRS satellite.
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Urban
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Suburban
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Semi-rural
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Rural
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Dark site
The above demonstrates the estimated effect of light pollution - graphics created using Stellarium.
Best time to visit
The below chart shows when the skies will be at their darkest at this location and therefore the best time to visit. Moonlight is shown in light yellow and the Sun's twilight in light blue. Midnight on the date shown is shown as a white line with sunset to the left and sunrise the next morning to the right. A black background with stars shows the best times for stargazing. See our dark sky calendar for more details.
Tue 16th Sep
Wed 17th Sep
Thu 18th Sep
Fri 19th Sep
Sat 20th Sep
Sun 21st Sep
Mon 22nd Sep
Find more dates
If you are planning to visit this location check our dark sky calendar to find out when is best!
CalendarForthcoming events
Below is a list of events at Dyffryn Observatory. View these events on our calendar, add them to your calendar or Google Calendar.
Stay and gaze nearby
Stay at one of these stargazing-friendly accommodation providers.