http://www.standingstones.org is a resource site for people who want to study Archaeoastronomy for Stone Circles, Standing Stones, Stone Rows and Henges in Britain and Ireland.
The site providers a viewer to display the historic rising and setting points of the Sun and Moon for most of these sites in the UK and Ireland. The viewer has data accumulated from around 4000 sites across the UK and Ireland including many Stone Circles, Standing Stones, Stone Rows and Henges.