SUNDIAL

 

   

   Sundial time with the help of the virtual position of the Sun in the day sky. Usually via the shadow on a flat or guilty of throwing stick, urinary positioned under different angles. If it is properly made shows exactly throughout the year. 

   For the oldest Sundial is the tomb of Knowth in the Neolithic transition time in the Valley ofte river Boyne in Ireland (5000BC). Other ancient sundials and shadow clocks were obelisks (3500BC) of ancient Egypt and Babylon (1500BC). The first written note sundials can be traced in the year 742BC. The oldtestament for about a year 700BC describes the sundial-the time from Ahaze. Probably this i the earliest record of the sunny hours, witch cannot be faund. Solar watces are know also China, but little is know about them. the ancient Greeks developed several of the principlesand forms of the sunny hours. They also perfected tge geometry and the taper into the. The Romans adopted the Greek sundials.

         World's oldest sundial, from Egypt's Valley of the Kings (1500 BC)