WyBlog

Muslims around the world could be setting their watches to a new time soon when the world's largest clock begins ticking atop a soaring skyscraper in Islam's holiest city of Mecca.

Saudi Arabia hopes the four faces of the new clock, which will loom over Mecca's Grand Mosque from what is expected to be the world's second tallest building, will establish Mecca as an alternate time standard to the Greenwich median.

It boasts four glimmering 46 metre-across (151 feet) faces of high-tech composite tiles, some laced with gold, sitting more than 400 metres (1,320 feet) over the Holy Haram compound.

More than six times larger in diameter than London's famed Big Ben, the clock faces, with the Arabic words "In the Name of Allah" in huge lettering underneath and will be lit with two million LED lights.

Some 21,000 white and green coloured lights, fitted at the top of the clock, will flash to as far as 30 kilometres (18.7 miles) to signal Islam's mandatory five-times daily prayers.

On special Muslim occasions, 16 bands of vertical lights will shoot some 10 kilometres (6.2 miles) up into the sky.

"We in Mecca hope to be the world's central time zone, and not just have a clock to look at, to show off," said Mecca resident Hani al-Wajeeh.

The clock reflects a goal by some Muslims to replace the 126-year-old Universal Time standard -- originally called Greenwich Mean Time (GMT) -- with Mecca mean time.

At a conference in Doha in 2008, Muslim clerics and scholars presented "scientific" arguments that Mecca time is the true global meridian. They said that Mecca is the centre of the world and that the Greenwich standard was imposed by the west in 1884.