It’s a throwback! Antique baseball opens Prospect Park anniversary

Park Slope: See this story at BrooklynDaily.com.By Caroline SpivackBrooklyn DailyIt’s a whole old ball game!Sluggers with the historical Atlantics Baseball Club of Brooklyn will knock ‘em out of the park — Prospect Park, that is — for the green’s “150th Opening Weekend Celebration” on April 1. The old-timey baseball club will usher in the spring season with a pair of games played by 1860s rules — and shed light on the roots of America’s pasti