How accurate is time?

Question

Given that the full rotation of the earth on it's axis is, when divided by 24 gives us an hour of time. 24hrs = 1day = 1rotation

1orbit of the earth around the sun = 365 1/4 days = 1year

This can be viewed as a measure of time.

How accurate is the math? Is the timing still the same are we getting faster/slower?

Is the planet earth still on same angle of tilt along the axis (magnetic poles)?

Would it remain accurate?

on which way is time measured if this process is inaccurate?

Answer 1

We have long since progressed to more accurate clocks than the rotation of the Earth. The current atomic time standards are accurate to 1 second in 20 million years. The length of the day is increasing by about 15 microseconds per year, so Earth will lose five minutes in that 20 million years. What's more, scientists can track seasonal variations in the spin rate due to climate effects.

Answer 2

We do not rely on either Earth's revolution around the sun or Earth's revolution on its axis for a standardized time measurement purposes. Now, "the second is currently defined as the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom." That way, we can always tell how "fast" (or slow) a second is, because the Earth is always getting farther from the sun and the Earth may or may not be slowing down in terms of how long a day is.