[Old_Mil]

We hang onto Newton's laws because they are computationally cheap approximations that will serve in most low-cost earthbound circumstances, not because they constitute a proper subset of Einstein's laws.

You're contradicting yourself. If they weren't an adequate approximation of a subset of Einstein's Laws for the reference frame of Earth, holding on to them as a low-cost computational approximations would be pointless.

[RadioAstronomer]

If they weren't an adequate approximation of a subset of Einstein's Laws for the reference frame of Earth, holding on to them as a low-cost computational approximations would be pointless.

Huh? Newton came first. Fortunately Newtonian Mechanics are "good enough" for many calculations. However, they are not good enough for much of what I do. Thusly GR must be used.

[donh]

You're contradicting yourself. If they weren't an adequate approximation of a subset of Einstein's Laws for the reference frame of Earth, holding on to them as a low-cost computational approximations would be pointless.

That is totally ditzy logic.