View Single Post
beech
#1
Oct20-09, 03:32 PM
P: 5
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.
Phys.Org News Partner Astronomy news on Phys.org
Fermi satellite detects gamma-rays from exploding novae
Research finds numerous unknown jets from young stars and planetary nebulae
Image: Hubble serves a slice of stars