Time Measurement on Earth vs the Universe

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SUMMARY

The discussion centers on the relationship between Earth's time measurement systems and the broader universe, specifically addressing how Earth's 24-hour day and 365-day year correlate with cosmic time. It highlights that time is defined by cycles, such as the atomic definition of a second based on caesium-133 transitions. The conversation also explores whether Earth's timekeeping is affected by the universe's expansion, concluding that while Earth's movement is relative to cosmic background radiation, time is generally calculated independently of this expansion.

PREREQUISITES
  • Understanding of the atomic definition of time, specifically the caesium-133 standard.
  • Familiarity with the concept of cosmic background radiation.
  • Knowledge of the Big Bang model and universal expansion.
  • Basic principles of time measurement and cycles.
NEXT STEPS
  • Research the implications of cosmic background radiation on time measurement.
  • Study the relationship between universal expansion and timekeeping methods.
  • Explore advanced topics in cosmology, particularly the works of T. Padmanabhan.
  • Investigate alternative models of time measurement beyond Earth's systems.
USEFUL FOR

Astronomers, physicists, cosmologists, and anyone interested in the intersection of time measurement and cosmic phenomena.

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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