On 22-24 October 2009, the International Year of Astronomy 2009 Cornerstone Project, Galilean Nights, will see amateur and professional astronomers, enthusiasts and the public taking to the streets all around the globe, pointing their telescopes to the wonders that Italian astronomer Galileo observed 400 years ago.

Spread over three nights, astronomers will share their knowledge and enthusiasm for space by encouraging as many people as possible to look through a telescope at our planetary neighbours. The focus for Galilean Nights is the objects that Galileo observed, including Jupiter and the Moon, which will be well-positioned in the night sky for observing.

Galilean Nights runs just before Autumn Moonwatch in the UK (24 October until 01 November).

As part of Galilean Nights there is an astrophotography competition running on Flickr, closing date 27 October 2009