It sounds like a really reasonable explanation. Until you mount the sundial on the wall. On a wall-mounted sundial, the shadow moves counter-clockwise (in the

It sounds like a really reasonable explanation. Until you mount the sundial on the wall. On a wall-mounted sundial, the shadow moves counter-clockwise (in the Northern hemisphere, the hemisphere referred to throughout this article). Yes, the idea of mapping the horizontal sundial to a vertically-oriented image in our minds seems to hold a certain sense... ...but the question of the vertically mounted sundial should not be so quickly dismissed.