Time Measurement on Earth vs the Universe

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Discussion Overview

The discussion centers on the relationship between time measurement on Earth and the broader universe, exploring how human constructs of time, based on Earth's orbit and cycles, relate to cosmic phenomena such as the expansion of the universe and the big bang model. The scope includes theoretical considerations and implications of time measurement in cosmology.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that there are numerous models for time measurement based on Earth's planetary orbit and its relationship to the universe.
  • Others argue that human timekeeping, defined by cycles such as the 24-hour day and 365-day year, may not have a direct correlation with time as it exists in the universe.
  • One participant suggests that time on Earth could be affected by its movement relative to cosmic background radiation, implying that variations in velocity might influence timekeeping.
  • Another viewpoint indicates that time is typically calculated independently of the universe's expansion, although the correlation with time since the big bang is noted to be weak.
  • There is a suggestion that Earth's natural motion within the universe may affect how time is perceived or measured, but this remains a point of contention.

Areas of Agreement / Disagreement

Participants express differing views on whether time measurement on Earth is relevant to the universe's expansion and how these concepts interact. There is no consensus on the relationship between terrestrial timekeeping and cosmic time.

Contextual Notes

Some claims depend on specific definitions of time and assumptions about cosmic motion, which are not universally agreed upon. The discussion reflects a variety of perspectives without resolving the complexities involved.

petermorrisjr
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There are quite possibly billions of models for time measurement in the known universe using our planetary orbit model.
Human use of the 24 hour day night sequence and 365 day year using Earth's orbit of sun and our solar system and our place in our local galaxy and our place in the known universe.has our time model any relationship to time in the known universe.Time measurement is practical to mankind for all the known reasons.
Is time on Earth moving at any speed which is relevant to change in the universe,the big bang model including expansion of the universe.Is time to be calculated in correllation with the speed of the expansion of the known universe,or a seprate model thet separates time measurement from the model of expansion.
Or is the Earth naturally being part of the universe automatically move in conjunction with the universes expansion and our model of time keeping as such become relevant.
 
Space news on Phys.org
Reading material:
http://www.arxiv.org/abs/astro-ph/0602117
Advanced Topics in Cosmology: A Pedagogical Introduction
Authors: T. Padmanabhan
Try to avoid using the word 'seprate'. It diminishes your credibility.
 
Chronos said:
Reading material:
http://www.arxiv.org/abs/astro-ph/0602117
Advanced Topics in Cosmology: A Pedagogical Introduction
Authors: T. Padmanabhan
Try to avoid using the word 'seprate'. It diminishes your credibility.

Sorry for the spelling mistake,I always wanted to have credibility.
 
petermorrisjr said:
There are quite possibly billions of models for time measurement in the known universe using our planetary orbit model.
Human use of the 24 hour day night sequence and 365 day year using Earth's orbit of sun and our solar system and our place in our local galaxy and our place in the known universe.has our time model any relationship to time in the known universe.Time measurement is practical to mankind for all the known reasons.

Sure, time is determined by number of cycles passed, such as the number of tick and tocks which have occurred on a clock, the number of times the Earth has gone around the sun, or more accurately, the "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" which is the definition of the second.

petermorrisjr said:
Is time on Earth moving at any speed which is relevant to change in the universe,the big bang model including expansion of the universe.

Earth is moving with respect to the cosmic background radiation originated from the "early universe", so any movement with respect to this expanding radiation field could be thought of as a deviation from the norm. Any increase in such velocity would represent a slow down in the clock.

petermorrisjr said:
Is time to be calculated in correllation with the speed of the expansion of the known universe,or a seprate model thet separates time measurement from the model of expansion.

Time is calculated without considering the expansion of the universe. However, if you mean the time since (t=0) in the big bang, I will say this - the correlation is very weak since the expansion of the universe varies along the line of sight.

petermorrisjr said:
Or is the Earth naturally being part of the universe automatically move in conjunction with the universes expansion and our model of time keeping as such become relevant.

The earth, sun, and galaxy is moving with respect to the cosmic background radiation, so the "clock rate" will be different than that of the "mean clock rate".
 

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