The largest of the pendulum world clock of Mecca, is running from August 11, 2010 (1st Ramadan 1431). The clock has four faces, will replace the Greenwich Meantime (GMT). This will be the Mecca Mean Time (Mean Time to Mecca). The pendulum is at the top of the Tower, 601 meters high. The call to prayer will also be broadcast from this tower, which allow priors to hear at a distance of 7 km.
