bossman72,
It's a 90d angle to the line of flight of the throw. 1B is just the apex of the angle and the "anchor" of your adjustment to that line of flight. On a typical grounder to F5, (coming from "A" of course) you will be at a 45d angle to the 1B line with the bag at the apex. As the throw originates from a point more towards 2B, and , possibly 1B, you correspondingly decrease your angle to the 1b line.
As that progress towards 1B continues, the umpire will eventually experience too great a degree of "pressure" from the fielders, and it may become impractical to move into fair territory, and he should create an angle from foul territory instead.
JM
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