Earth Hour at Sydney Observatory

Saturday 25 March 2017, 7–9.30pm

Celebrate Earth Hour at Sydney Observatory with a special evening under the stars. Join us for an unrivaled view of the night sky as the city switches its lights off in support of Earth Hour and the stars shine brighter than ever.


Enjoy a FREE evening of astronomy and climate action with telescope viewings, hands-on activities, shadow puppets, and an exciting line-up of talks on light pollution, astronomy and the environment. Plus learn from astronomers and take a stroll through the Observatory lit only by candlelight.

Pre-book a planetarium session to gain a new perspective on the night sky!*

All ages. Food available for purchase.

*Planetarium sessions not included in the free events. Tickets for Planetarium sessions are $10 and must be pre-purchased here.

Maximum 10 tickets per transaction.

Earth Hour

Earth Hour launched in Sydney in 2007, with 2.2 million people and 2,100 businesses participating in the ‘lights off’ event. Just one year later, Earth Hour became a global phenomenon with over 35 countries, and an estimated 50-100 million people participating.

2017 will mark the 10th anniversary of Earth Hour as a global phenomenon. What started as an Aussie idea has grown into a global force of nature, that is now celebrated in over 172 countries and over 7,000 cities and towns worldwide. The symbolic hour has grown into the world’s largest grassroots movement for the environment, with beyond-the-hour projects and initiatives happening throughout the year.

Earth Hour is a great home-grown success story: an Aussie campaign designed to draw attention to tackling global warming and get people talking about what we can do to help.

In Australia, Earth Hour is something that really brings communities together, with 1 in every 4 Australianstaking part. In 2016, millions of Australians took part in Earth Hour to show their support for a low pollution, clean energy future, one in which we can continue to enjoy the best of nature and our great Aussie outdoor lifestyle.