Ground Zero ceremony: How it'll begin, end
8:35 a.m. Program begins.
8:46 a.m. Mayor Michael Bloomberg calls for a moment of silence to mark the moment that the north tower was struck. Houses of worship toll their bells. President Barack Obama delivers reading. Relatives of 9/11 victims begin reading names.
9:03 a.m. Moment of silence to mark the time the south tower was struck. Former President George W. Bush delivers reading. Honor Guard opens family entrance, and families enter the Memorial Plaza.
9:59 a.m. Moment of silence to mark time the south tower fell. New Jersey Gov. Chris Christie delivers reading.
1 p.m. Program ends.