Fang Tiannan Feng Shui Lecture.

Pilots see that the sun is always in the southern sky, indicating that the flight direction of the plane is the same as the apparent motion direction of the sun, that is, opposite to the rotation direction of the earth; The flight speed is the same as the angular velocity of the earth's rotation. Because the plane is flying at low altitude, it can be approximately considered that the flight speed of the plane is about the linear rotation speed of the earth at this latitude. The plane flew over 60 degrees north latitude.