Changes

:Three decades of experiments, ranging from the standard light-deflection and perihelion-shift tests to lunar laser ranging, planetary and satellite tracking, and geophysical and astronomical observations, have placed bounds on the PPN parameters consistent with general relativity.

:Three decades of experiments, ranging from the standard light-deflection and perihelion-shift tests to lunar laser ranging, planetary and satellite tracking, and geophysical and astronomical observations, have placed bounds on the PPN parameters consistent with general relativity.

"PPN" is the ''parameterized post-Newton" formalism, a rewriting of the law of universal gravitation to include coefficients derived from general relativity. The Einstein field equations are nightmarish to solve, so PPN was created as a middle-ground approximation between the (good but not good enough in some contexts) Newton approximation and the agonizing pain of having to actually ''solve'' the Einstein field equations every time you want to calculate the delta-vee required during a solar slingshot maneuver for a planetary probe. What Will said in that paper is the PPN approximation has been tested ''against general relativity'' and supported by 30 years of experiments.

"PPN" is the ''parameterized post''-''Newton'' formalism, a rewriting of the law of universal gravitation to include coefficients derived from general relativity. The Einstein field equations are nightmarish to solve, so PPN was created as a middle-ground approximation between the (good but not good enough in some contexts) Newton approximation and the agonizing pain of having to actually ''solve'' the Einstein field equations every time you want to calculate the delta-vee required during a solar slingshot maneuver for a planetary probe. What Will said in that paper is the PPN approximation has been tested ''against general relativity'' and supported by 30 years of experiments.

This is really getting into the tall grass, and I know how you hate wasting time. Maybe we can bring this conversation to a conclusion? --[[User:KSorenson|KSorenson]] 21:38, 14 November 2009 (EST)

This is really getting into the tall grass, and I know how you hate wasting time. Maybe we can bring this conversation to a conclusion? --[[User:KSorenson|KSorenson]] 21:38, 14 November 2009 (EST)