A star finder that allows visible stars to be identified for any date and time for locations in the Northern Hemisphere. Compiled by astronomical experts, Storm Dunlop and Wil Tirion and approved by the astronomers of the Royal Observatory Greenwich. Easy-to-use practical tool to help any astronomers identify the constellations and stars every day of the year. Just dial in the date and time by rotating the inner plastic disk showing the time until it lines up with the relevant day of the year on the outer ring. The part of the sky appearing on the planisphere shows the arrangement of the stars above you. This star chart is suitable for use anywhere in Britain and Ireland, Northern Europe, Canada and Northern USA. Best viewed as near to latitude 50 degrees north as possible. The moveable disk also comes in a plastic wallet which contains further information about stargazing.