There is so little change in the earth’s spin and revolution that the times and seasons have remained the same for the last 6000 years; 24 hour days, 365 1/4 day years ( they are based on revolutions around the sun and revolutions of the earth.) That would mean Methuselah really did live 969 of our years. You might enjoy this information from Tom Whiting on the astronomical earth year.
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“I know the spin rate (one day) is slowing down due to the gravitational effects of the moon…..about 3 millionths of a second per year (65 million years ago, the dinosaurs had a 20 hour day)….but I’ve never read where our speed around the sun has changed over the millenia.
In fact, I would assume that as we spiral in closer to the sun (very slowly) we would actually speed up, thus a slightly shorter length of year. But then again, the sun is continuously losing mass through the fusion process to produce energy, so that would allow the Earth (and all the planets) to drift outward slowly, thus lengthening the orbital (yearly) time period. Perhaps the two effects offset each other, because I’ve read nothing about the “year” growing longer (or shorter) as the centuries and millenia go by. But if it has, it certainly is not measurable in our lifetimes, and it would probably affect our calendar by only one day every few million years. “