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The moon is moving fast relative to the a line between the sun and earth.
Quoting: leader A poster above possibly OP calculated the two variables as such:
Instantaneous velocity of point at surface of the earth ~1000mph.
Instantaneous velocity of (centre of) moon at point of circumference of rotation around the earth ~2600mph.
If we consider the instant that a line from the centre of the sun, through the centre of the moon to that point on the ground occurs, we can model the basic physics without need to consider parallax, angular velocity or any complicating factors.
Instantaneously the point on the ground is moving west to east at 1000mph.
At the same instant the centre of the moon is moving west to east at 2600mph. An hour later, the same line centre of sun through centre of the moon should now be at a point ~1600m east of the first point etc.
We can project roughly this process to continue for the entire set of instances that the eclipse includes, giving the shadow the appearance of moving west to east at ~1600mph.
I am unsure whether OP is stirring or not, but surely if it means that much to the respondents that you would be hurling abuse, then you could make a simplistic yet accurate description?
There are actual real issues out there guys, why waste yourselves in combat in such a distraction?