This weekend around the world, Muslims will celebrate Islamic New Year. Some countries set the date astronomically, while others wait to observe local sightings of the moon. This is not to be confused with Nowruz (springtime Persian New Year) which is based on a solar calendar rather than a lunar one. Some Muslim-Americans will choose to fast and pray during this month, though it is not required. It is a time for mourning and peace; fighting is prohibited. Happy New Year!