You are talking about this North-South movement from
this University of Arizona diagram:
The above diagram is not to scale, but we can compute with the correct values. Starting from the New Moon position in the diagram lets calculate how fast the Moon is descending Southward.
To get the dimensions of one of the sides of the triangle to the right of the Earth in the above image we can fill out a
Triangle Calculator with 5 degrees, 238900 (avg distance from earth to moon in miles), and 90 degrees.
This creates the following result:
The shortest side a, the Opposite Side, is 20,201.13241 miles
We take this value and double it to get the Opposite Side of the other triangle that would be on the lower left of the diagram scene when it approaches Full Moon.
20,201.13241 miles x 2 =
40402.26482 MilesThere are 29.5306 days in a lunar month, the time it takes to get from New Moon to the next New Moon. This should be divided by two to get the time from New Moon to Full Moon
29.5306 / 2 = 14.7653 days in half a lunar month
Half a lunar month in hours is
354.3672 HoursNow, to get the speed the Moon is traveling Southward we can divide distance by time:
40402.26482 / 354.3672 =
114.0124 Miles Per HourThe total time of the Aug 12, 2026 total eclipse shadow can be found on
https://www.timeanddate.com/eclipse/solar/2026-august-12First location to see the full eclipse begin Aug 12 at 16:58:09 (UTC)
Last location to see the full eclipse end Aug 12 at 18:34:07 (UTC)
This is only about 1 hour and a half hours, and according to the maps the total eclipse shadow is traveling a distance equivalent to about the diameter of the Arctic Circle. Unless you are proposing that that North-South distance traveled is only about 171 miles, this does not make sense.
The shadow should obviously be moving Southward far slower.