This is a common explanation:
A tailwheel airplane is on the takeoff roll and the tail comes up, the propeller disc rotates forward. That's akin to someone pushing on the top of the disc. The force results 90 degrees ahead, or on the right side, pushing the nose left.
I do not understand the term "90 degrees ahead".
In my mind, in this example, we are viewing the propeller spinning clockwise. If a force is applied at the top (12 oclock), then the resulting gyroscopic force on the right (3 oclock) should be called 90 degrees after. If the force is applied at 12 oclock, spines 90 degrees and then a resulting force at 3 oclock, why is that called before instead of after?