Tumeni, you subtract the speed of the earth's rotation from the speed of the moon around the earth to say that the moon's shadow is traveling over the earth faster than the Earth's rotation.
- - - No, I subtract the speed of any point on the surface from the speed of the Moon's shadow.
And that this shadow is traveling from West to East at a speed of about 1200mph to make the eclipse path from the west coast of the US to the east coast. The moon is passing in front of the sun at a speed of 1200mph to make the Eastwardly moving shadow which moves at that speed.
How can this be the case when observers see the moon passing in front of the Sun from East to West, not West to East?
See: https://www.timeanddate.com/eclipse/solar/2017-august-21
The Moon starts in a Eastern direction on the Sun and ends in a Western direction on the Sun.
- - - When observed from Earth, both objects move East to West during eclipse, in the same direction they always do
If the Moon was passing by overhead West to East at 1200 miles per hour to make an eclipse path from West to East on the Earth's surface, then one is inclined to think that we should see it start from the West on the Sun.
Once again, the Moon and the Moon's shadow exhibit two distinct forms of motion.
The Moon circles the Earth once every 28 days, whilst the point on the Earth observing the Moon moves in a circle once every day. The point on the Earth speeds along Eastward in a faster circle than the Moon itself, so the Moon is seen in the sky to move from East to West. The Moon lags behind the observer
The shadow moves across the space occupied by the Earth in a purely linear manner, passing over a distance, at maximum, of 7917.5 miles, at a speed of roughly 2200 mph, Eastward. Any chosen point on the surface under this shadow is moving at max 1000 mph approx, also Eastward. The shadow has
no rotational aspect around the Earth, so cannot be considered in terms of its angular position with respect to the Earth or observers.
Once again, with two motions Eastward, one of 2200 mph, one of around 1000 mph, the net result is 2200 - 1000 = 1200 mph, approx, still Eastward.