A little late, but Happy Jackie Robinson Day

The No. 42 is retired by all 30 Major League teams, but every big league player is taking the field on Sunday with those digits on his back, in commemoration of Jackie Robinson Day.

April 15 was dedicated as Jackie Robinson Day in 2004, to honor the anniversary of Robinson breaking baseball's color barrier in 1947 with the Brooklyn Dodgers. His number has been retired league-wide since 1997, but starting in 2009, Major League Baseball has requested that all on-field personnel don that special jersey for one day.

The number is only one facet of the celebration. MLB also is releasing a new national public service announcement voiced by Hall of Fame broadcaster Vin Scully, who once called Robinson's games.

Every club playing a home game on Sunday also is holding a special pregame ceremony in its ballpark, including one featuring the Robinson family at Yankee Stadium before the team's 8:05 p.m. ET game against the Angels. Clubs currently on the road will hold ceremonies during a homestand later this month.

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