Researchers have unearthed one of the world's oldest Egyptian sun dials - possibly dating back to 13th century BC - used by the people to tell time with the position of the Sun.

The discovery was made during archaeological excavations in the Kings' Valley in Upper Egypt by a team of researchers from the University of Basel.

The team led by Professor Susanne Bickel made the significant discovery while clearing the entrance to one of the tombs.

During this year's excavations the researchers found a flattened piece of limestone (so-called Ostracon) on which a semicircle in black colour had been drawn. The semicircle is divided into twelve sections of about 15 degrees each....