Vertical sundial northern orientation

Previous exhibit                                                                                                                   Next exhibit

EXHIBITS    >    The clocks of the ancient Greeks    >   

Vertical sundial
northern orientation

A vertical net orientated to the North with 5 engraved hour lines and one curve indicates (from up to down on its right part), with the help of the shadow trace from the horizontal (vertical to the net) gnomon tip, 2 unequal (depending on the season) daily hours after the sunrise (1st and 2nd) and (from down to up on its left part) 2 unequal (depending on the season) daily hours before the sunset (11th and 12th). The right horizontal hour line at the height of the gnomon indicates the sunrise and the left one the sunset. The curve indicates the course of the sun's shadow at the summer solstice.