Assuming the earth to be perfectly spherical, the radius of the earth to be 6400 km and that the earth completes its one complete rotation in 24 hours, the speed of a city (in this case, I am considering city to be a point object) will be: 499.99m/s. Wow! Thatýs so huge. Never thought it would be that high! We wouldnýt feel it to be going at such high speed as the atmosphere is also moving with us. Its all relative thing. Anyway, that was just my tryýmight be wrong too. (I found the radius of the circle at 22.5 degrees to be (640000 Cos 22.5)m. And its simple after that.