Is there more than one meaning for "gravitational shear". It seems to refer to focusing of light beams. When I calculate the difference in velocity, of earth's side closest and farthest from the sun: the difference is about one meter/second. Is that gravitational shear? Calculation Orbital velocity is 2 times pi times the distance to the sun, divided by time, in this case the number of seconds in a year. Velocity of Earth v1 =2 * pi * 1.5 * 10^8 / ( 365.25 * 24 * 60 * 60 ) = 29.8653 km/sec. v2 =(2 * pi * 1.5 * 10^8 - radiusEarth) / ( 365.25 * 24 * 60 * 60 ) Subrtact v1 - v2 The Radius of Earth is 6378 km. The orbit is inclined to have a different velocity, at the sides nearest and farthest from the sun. This difference is, 1.27 meters/sec.