Sit Beside The Gnomon

Joe was an inventive boy. His go-carts were better than anyone else's. But he never expected that the sundial he and his friends discovered buried on top of their favourite go-carting hill, would transport them into an astonishing future they helped to create. But would they ever get back to their own time?... and what would it mean for the future if they were stranded?...

Sit Beside the Gnomon was first published in the 1980s. The future Joe and his friends visit in this story is now rapidly approaching us.