RE: Dear stupid: how many times does the earth rotate in a year?
June 29, 2016 at 1:17 am
(This post was last modified: June 29, 2016 at 1:18 am by vorlon13.)
Well, here's a new complication:
the current (6/25/16) issue of Science News reports that the innermost core of the earth has experienced 2 1/2 years less elapsed time over the last 4.5 billion years due to a subtlety in Einsteins general relativity than the earth's surface has.
With the warping of space-time due to the gravitational pull of the earth, clocks run ever so slightly slower at the earth's center than they do at the surface. Now, assuming the inner core is sufficiently coupled to the rest of the planet to not experience any slippage or advance over the surface, we still have a discrepancy in the length of time elapsed at the surface vs the innermost core over the course of a 'year' now.
A further complication will ensue when the number of rotations of the earth in a given arbitrary interval is referenced to the 'fixed stars'. The suns gravitation well will also distort the specific amount of time during a year as noted on earth at a specific gravitational flux level from the sun vs the amount of time elapsed en masse by those distant stars.
Another further complication would be those 'fixed stars' taken in aggregate in a worse case analysis if they were directly in line between the sun and the center of the galaxy or directly opposite, as again those stars closer to the center of the galaxy will experience a different (shorter) elapsed time during the course of an arbitrary earth year as opposed to those stars further from the sun relative to the galaxy's center as they will experience a longer elapsed time during that same year.
And, the galaxy is rotating, throwing off this concept of the 'fixed stars' as they are in a rotating system with a rotation rate of ~ 4 revolutions per billion years, a significant % of the total 4.5 billion years (and 4.5 billion revolutions around the sun X the number of daily rotations accruing each year. More correctly, instead of measuring against the 'fixed stars' the measurements need to be relative to distant quasars, whose motions en masse are not moving tangentially to any direction the earth is turning.
I hope this clears up everything adequately.
the current (6/25/16) issue of Science News reports that the innermost core of the earth has experienced 2 1/2 years less elapsed time over the last 4.5 billion years due to a subtlety in Einsteins general relativity than the earth's surface has.
With the warping of space-time due to the gravitational pull of the earth, clocks run ever so slightly slower at the earth's center than they do at the surface. Now, assuming the inner core is sufficiently coupled to the rest of the planet to not experience any slippage or advance over the surface, we still have a discrepancy in the length of time elapsed at the surface vs the innermost core over the course of a 'year' now.
A further complication will ensue when the number of rotations of the earth in a given arbitrary interval is referenced to the 'fixed stars'. The suns gravitation well will also distort the specific amount of time during a year as noted on earth at a specific gravitational flux level from the sun vs the amount of time elapsed en masse by those distant stars.
Another further complication would be those 'fixed stars' taken in aggregate in a worse case analysis if they were directly in line between the sun and the center of the galaxy or directly opposite, as again those stars closer to the center of the galaxy will experience a different (shorter) elapsed time during the course of an arbitrary earth year as opposed to those stars further from the sun relative to the galaxy's center as they will experience a longer elapsed time during that same year.
And, the galaxy is rotating, throwing off this concept of the 'fixed stars' as they are in a rotating system with a rotation rate of ~ 4 revolutions per billion years, a significant % of the total 4.5 billion years (and 4.5 billion revolutions around the sun X the number of daily rotations accruing each year. More correctly, instead of measuring against the 'fixed stars' the measurements need to be relative to distant quasars, whose motions en masse are not moving tangentially to any direction the earth is turning.
I hope this clears up everything adequately.
The granting of a pardon is an imputation of guilt, and the acceptance a confession of it.
