Office for Astronomy Outreach

100 hours of astronomy

100 Hours of Astronomy

100 Hours of Astronomy is a yearly global celebration organised by the Office for Astronomy Outreach (OAO) that invites people of all ages and backgrounds to come together and connect with the night sky — and with the science that helps us understand it.

From vibrant cities to the most remote corners of the world, this event brings astronomy closer to communities everywhere. Through public stargazing, workshops, talks, and hands-on educational activities, 100 Hours of Astronomy sparks curiosity, encourages shared exploration of the cosmos, and invites us all to reflect on our place in the Universe.

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This year, we encourage everyone to visit their local planetarium – small, large, mobile, or stationary – and immerse themselves in the wonders of our Universe.

Main activities and events during 100 Hours of Astronomy

24 Hours of the Planetarium Livestream Schedule

Find your community on the schedule below and join us for a full 24-hours of astronomy engagement from around the world!

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OAO Astronomy Engagement Events

To highlight all the amazing activities happening around the globe, we will promote a calendar of events displayed on a world map and our social media channels.

This interactive map will allow visitors to explore initiatives by region, discover local outreach efforts, and connect with communities that share a passion for astronomy.

Astronomy Engagement Events

More Information

All events must respect the general guidelines of the IAU Global Project and Themes, which promote the key role of astronomy for the betterment of science and society through collaboration and with a spirit of respect, tolerance, and peace.

If you need to change your events already on the calendar, please email the IAU Office for Astronomy Outreach Team via public@...Click to show with the subject line “100 Hours of Astronomy Calendar 2025 - Update”.If you cannot submit through this form, please email the IAU Office for Astronomy Outreach team via public@...Click to show with the subject line “100 Hours of Astronomy Calendar 2025 - Update”.