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$\begingroup$ Thanks for the answer. Yes, I understand the definition of homogeneity/isotropy, but if ground frame is inertial(in newtonian, which we know it is), how is space in it isotropic ? we know it's not isotropic. i don't know how landau's statement holds true in newtonian mechanics. maybe i misunderstood your answer :( $\endgroup$
– Giorgi Lagidze
Commented Nov 5, 2023 at 11:50
$\begingroup$ What do you mean for "ground frames"? $\endgroup$
– Valter Moretti
Commented Nov 5, 2023 at 11:53
$\begingroup$ you, being on earth's surface(as you're currently). in newtonian, it's considered inertial frame, but if you conduct experiments, you will see that space to you is non-isotropic $\endgroup$
– Giorgi Lagidze
Commented Nov 5, 2023 at 11:54
$\begingroup$ Well it is false: earth's surface does not define an inertial frame at all. $\endgroup$
– Valter Moretti
Commented Nov 5, 2023 at 11:55
$\begingroup$ so, ground frame is not "inertial frame" even in newtonian mechanics ? $\endgroup$
– Giorgi Lagidze
Commented Nov 5, 2023 at 11:56

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