So are we asking is time linear in accordance to the physicist definition of time or the time we use to record our time here on Earth?
A mean sidereal day is about 23 hours, 56 minutes, 4.0916 seconds (23.9344699 hours or 0.99726958 mean solar days), the time it takes the Earth to make one rotation relative to the vernal equinox...
If you are asking that question, then I think that, using the parameters you gave, time is NOT linear (if "linear" is taken to mean steady and constant). The speed at which the earth revolves around the sun is not constant, from what I understand. Nor, I think, is the rate of daily rotation absolutely the same for each day of the year. Physicists use averages (based on sidereal time, not "solar time") for example:
What I mean by linear is...
You're right. I didn't think the question through. I suppose I could have asked "is time constant?"
Also I came across this--I don't know if it valid or not
Linear time is a major feature of our Western cultural world-view, apparently initiated by Newton some 300 years ago. It portrays time as an absolute physical reality, and says that the passage of time is independent of consciousness
“Although time, space, place and motion are very familiar to everyone, it must be noted that these quantities are popularly conceived solely with reference to the objects of sense perception. And this is the source of certain preconceptions; to eliminate them it is useful to distinguish these quantities into absolute and relative, true and apparent, mathematical and common.
Absolute, true, and mathematical time, in and of itself and of its own nature, without reference to anything external, flows uniformly and by another name is called duration. Relative, apparent, and common time is any sensible and external measure (precise or imprecise) of duration by means of motion; such a measure – for example, an hour, a day, a month, a year – is commonly used instead of true time...
In astronomy, absolute time is distinguished from relative time by the equation of common time. For natural days, which are commonly considered equal for the purpose of measuring time, are actually unequal. Astronomers correct this inequality in order to measure celestial motions on the basis of a truer time. It is possible that there is no uniform motion by which time may have an exact measure. All motions can be accelerated and retarded, but the flow of absolute time cannot be changed.”
This true and absolute time implies that the simultaneity of two events is an absolute fact. It is independent of the location or of the state of movement of the observers. Time flows the same for all, just as the sun shines the same on all, just and unjust alike.
It is possible that there is no uniform motion by which time may have an exact measure. All motions can be accelerated and retarded, but the flow of absolute time cannot be changed.”
I started the OP from the point of view of the naive realist.
Apparently, the faster you move, the slower time runs for you
I wish someone could explain that in language I can understand
We all heard of lunar year, and the number of days in February changes to show the change in our earth's rotation.
... lunar year, ...February changes.... in our earth's rotation....... most accurate timing.... is the atomic clock