Pyramids Were Constructed 1000s Of Years Ago But Some Facts About Them Are Still Astonishing

Clockwork

The clock of Royal Observatory in Greenwich is set to GTC (Greenwich Mean Time or Prime Meridian Time) and that is about 13 degrees away from the magnetic true North! This clock came to function in 1675. If this clock could not get the precise angles in the 17th century then how did Egyptians manage to find true North with such precision? Is it possible that they had a clock which much different and better than ours?