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. The clock is targeted to enter service with a three-month trial period in the first week of the holy month of Ramadan on or about August 12, according to...