How fast does sunrise move across the US at 40°North?

How fast does sunrise in miles per hour appear to move at 40°North?

Maybe I’m wrong here, but the sunrise has to travel 360 degrees in 24 hours, so 15 degrees per hour. At 40 degrees latitude, one degree of longitude is about 53 miles, so (15x53) it would appear to travel at 795 miles per hour.

I concur. Typed this into Google:

*2pi(radius of earth)cos(40 degrees)/(24 hours) in mph

and got 795 mph.

If you want to get really pedantic, you need to allow for the “fattening” of the Earth towards the equator:

I gotta say, the 21st Century sure is awesome.