In addition, bases will become 18-inch squares in the Atlantic League, up from the 15-inch squares that have been standard since 1877. That will in effect cut the distance from the front of home plate to the front of first base from 87 feet, 9 inches to 87 feet 6 inches. The 90-foot measurement between bases is from the back of the plate to the back corner of first and third along the foul line.