From sunrise to sunset, residents across Long Island will stop on Monday to reflect on the friends, neighbors or family members who died during the terrorist attacks at the World Trade Center on Sept. 11, 2001.

Nearly 500 Long Islanders were among almost 3,000 people killed on 9/11 at the World Trade Center, the Pentagon and on a plane that crashed in Shanksville, Pennsylvania. Towns and individual villages in Nassau and Suffolk are planning unique events to honor the fallen on the 16th anniversary of the disaster.

In Glen Cove, Mayor Reginald Spinello will join clergy, veterans and residents who lost a loved one on 9/11 for a recognition service at 8:40 a.m. in Pratt Park. There will be a color guard presentation, a poem reading, and a fire horn sounding to acknowledge the moments when the planes hit the World Trade Center towers.

Four people from Glen Cove died on 9/11, Spinello said. And many Glen Cove-based first responders took the ferry to Manhattan that day to bring the injured to Long Island hospitals, the mayor said.

“Every year still brings out very tragic memories for lots and lots of people,” Spinello said, adding that about 200 people will be at Monday’s event. “They’re many people in Glen Cove with an assortment of connections” to the almost 3,000 who died that day.

Meanwhile, in East Islip, 9/11 first responder James Albrecht will give a presentation about the events of 9/11 at 7 p.m. at the East Islip Library on East Main Street.

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Glen Cove and East Islip are just a few examples, but an even larger list of events includes memorials in Mineola, St. James and Massapequa.

Towns are hosting memorial services as well.

In the Town of Southampton, officials will raise a U.S. flag at 9:30 a.m. at Hampton Bays Elementary School to honor veterans, first responders and those who lost their lives. And in North Hempstead, town officials will hold a memorial service at 8 a.m. at Mary Jane Davies Park in Manhasset.

The biggest memorial service happening Monday will likely be in the Town of Hempstead. The town’s sunrise service at Point Lookout will feature the unveiling of a permanent Sept. 11 memorial with the names of everyone who died etched into the sides.

Town of Hempstead Supervisor Anthony Santino said town officials are expecting 2,000 people at the event.

For information on more 9/11 ceremonies across Long Island, go to newsday.com/911