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" ... Lorentz invariance is one of those physics terms that has a jargon-rich name, but a very simple meaning: the laws of nature are the same regardless of where or when you're measuring them. It doesn't matter if you're here or a billion light-years away; it doesn't matter if you're making your measurements now or billions of years ago or billions of years in the future; it doesn't matter if you're at rest or moving close to the speed of light. If your laws don't care about your position or motion, your theory is Lorentz invariant. ... "
" ... This is a situation where time-reversal invariance holds: where the T-symmetry is unbroken. Time reversal can be thought of the same way as motion reversal: if the rules are the same whether you run the clock forwards or backwards, there's true T-symmetry. But if the rules are different when the clock runs backwards from when the clock runs forwards, the T-symmetry must be broken. ... "