Star Count 2021 results

6th April 2021

What the 2021 results of our record-breaking citizen science project tell us about the levels of light pollution near you – and what we can do about it.

February 2021 saw thousands of you stepping up for deep, dark skies and helping us count stars to measure light pollution in your area.

Despite chilly nights and the coronavirus lockdown, you broke records with more of you than ever looking skywards to Orion. Here’s what we learned from your counts.

The results are in

Our biggest ever Star Count, with over 7000 of you participating, showed that 2021 saw much lower reports of bad light pollution across the UK than in 2020.

Only 51% of our star-spotters said that they could see only ten or fewer stars, meaning that they were experiencing severe light pollution. In 2020, 61% of people were in that boat, so 2021 has seen a pretty dramatic drop in severe light pollution!

We think that this might be down to a ‘lockdown effect’, as much of the country had strict coronavirus pandemic restrictions during Star Count week, 6-14 February 2021. With quieter urban areas and fewer large buildings in operation, it’s likely there’s less glow or leakage into our night skies.

More dark skies, less light leaking

2021 also saw more of you telling us that you could see a whopping 31 or more stars in Orion! This means you’re seeing the most stars of all of our stargazers, and enjoying truly dark skies.

And there’s good news here, too – 5% of you told us you had truly dark skies this year. This is another pleasing boost on the numbers of you experiencing this in 2020!

‘5% of you told us you had truly dark skies this year.’

We’re delighted to see that more of us can enjoy the natural wonder of the night sky. It’s an area we’ve long been passionate about, and we’ll keep monitoring light pollution to track future changes.

Explore our interactive map

Check out how your area shapes up and whether you’re you dazzled by light pollution or looking up at deep, dark skies.

A small number of counts didn’t make it onto the map, usually because of missing location information. As, as with any citizen science project, we spotted a few outliers that showed unusual results – these are still included here.

Explore the interactive map

What we’ll do now

If you’ve explored the map and noticed you’re being blinded by beams or left awake by leaking light, fear not. We at CPRE will continue our work of many years to influence policy and celebrate dark skies, ensureing that as many of us as possible can enjoy them.

‘Looking up at a starry night sky is a magical sight and one that we believe everyone should be able to experience.’
Emma Marrington, CPRE dark skies campaigner

Local councils can help, too, by considering dimming schemes to save energy (always of course in consultation with the police and community to ensure it’s the best fit for the area, and keeps everyone safe). We’ll keep engaging with councils to manage their lighting and cut carbon, help wildlife and let us all enjoy those starry, starry skies.