This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Rowbotham Earth not globe fig . en This shows the line of sight between North Wales and the Isle of Man in Britain and how Rowbotham used lines of sight from sea level to demonstrate how far below the horizon the other side would be The heights are puzzling The highest hill in the south of the Isle of Man is Barrule which is only