There are four villages within the Cuckmere Valley: Alfriston, Litlington, Lullington and West Dean.
Its northern border with Abington Pigotts follows a stream, and its western and eastern boundary with Steeple Morden and Bassingbourn follow field boundaries.
The sundial was eventually won in 1985 by Sue Cooper and Lizi Newman, who correctly worked out that it could only be found on July 22 (because Pi is sometimes rounded to 22/7) at the chalk horse at Hindover Hill near Litlington, East Sussex.