Counting stars in Orion can help beat light pollution – here's how to help -
The UK countryside charity CPRE is asking for help with its Orion Star Count 2022 project. You can take part this weekend by counting how many stars you can see in Orion and letting them know the results. That’s it. This activity brings people together and allows us to appreciate nature and experience the sky above. It illustrates how heritage is linked to the sky and what we’re losing through light pollution.
Rather than trying to measure how bright the sky is – which is pretty tricky – we can use stars. Stars differ in brightness levels, and usually the unaided human eye under good conditions can spot stars as faint as 6-7 magnitudes. As the sky gets brighter – due to bad lighting on Earth illuminating the sky and sending light back to us – we can’t spot the fainter stars anymore. As a result, if we pick out a certain area in the sky, the amount of stars we can see in it will give us a pretty good idea how bright the sky is.
Find a spot that is dark, where you feel comfortable and safe to watch the southern sky. Take your time to wait at least 20 minutes for your eyes to adjust to the darkness. Your eyes are marvellous and very sensitive, but need a bit of time to fully switch to night time vision. You can use that time to explore the stars in the sky – and find the constellation of Orion.
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