Be part of a global stargazing event

Try four simple stargazing challenges to win badges in our new UK 100 Hours event. Find star patterns and a planet in the night sky.

Join us any time during the 100 Hours to complete challenges and add markers to your town or city on our UK & Ireland map.

Add to calendar

Get ready and put a pin on our map by setting your marker and location now.

Your marker choice will be used during the 100 Hours to add your completed challenges to the map.

Follow us on Instagram @IAU_NOC_UK to see what people worldwide are doing to celebrate 100 Hours. It's all totally free and you don't need to register or give your exact location. We look forward to joining you under one sky 2-5 October!

100 Hours Under One Sky is a non-profit project led by the UK's International Astronomical Union (IAU)'s National Outreach Coordinator (NOC) team, with project partners Go Stargazing and the Republic of Ireland IAU NOC team. The project is funded by the IAU Office of Astronomy Outreach, and has also received funding from the Federation of Astronomical Societies and the British Astronomical Association. This project is part of the IAU's 100 Hours of Astronomy global event.