In
baseball, "first base" is the first of the four
canvas bags or
rubber plates which must be touched by a
runner in order to score a
run. Manned by the ever-important
first baseman. Unlike the other bases,
sliding into first base is
rare, unless you're going by a
certain alternative definition.
From the batter's perspective, first base is located 45 degrees to the right, 90 feet away from home plate.