TOPIC 12 -Time & Dating

TOPIC 12 -Time & Dating - Time QuestionsaboutTime...

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Time Changing Perspectives. Relative and Absolute Dating Methods.  Age of Objects in Our Universe. Einstein discovers that time is actually money.
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Questions   about Time Is there a beginning and end or is time  infinite?   ( Big Bang ) Is time continuous or infinite?  ( Quantum ) Is there something called time, apart from the  use of time as a counting activity? Is time an independent characteristic of our  universe, or  simply another dimension?  ( Relativity ) How old are objects in our universe? Atoms? Earth? Solar System? Universe?
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Wiki: 2 definitions Time  is part of the fundamental structure of the  universe, a dimension in which events occur in  sequence. Time  is instead part of a fundamental intellectual  structure (together with space and number) within  which humans sequence and compare events. It so  can define  Time  as “part of the measuring system  used to sequence events, to compare the durations  of events and the intervals between them, and to  quantify the motions of objects”. 
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Arrows of time Arrows of time  (1927, British astronomer Arthur Eddington):  Entropy arrow: Second law of thermodynamics = entropy  must increase over time;  The cosmological time arrow, which points away from the Big  Bang; The radiative time arrow, caused by light only traveling  forwards in time; Quantum arrow of time: wave function collapse, which is time  irreversible; A causality arrow: cause precedes its effect: the causal event  occurs before the event it effects; Psychological time: the cataloguing of ever increasing items  of memory: things we remember make up the past, while the  future consists of those events that cannot be remembered.
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Divisions of Time  (Human Concepts to Keep Track of Time) Seconds:  Minutes: Hours: Days: Years:  Calendars: Sumerians: 60 magical number:     - Divisions of circle.    - Finger counting system. Astronomical Long History:    -  Gods     - Astronomical     - Roman Emperors
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Influence of Technology  (Clocks) Natural Cycles:     Nature    Human Early Clocks:   Water clocks:  by ~1500 B.C.  in Egypt Sundials:  by ~600 B.C.  Greece and China Candles, “Hourglass ” :
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Early Water Clocks
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Pendulum (1657) Christiaan Huygens. Spring (1658): Robert Hooke.  Electronic (1839): Carl August, Swiss  physicist.  Atomic (1948): vibrations of atoms. Second now defined as 9,192,631,770 
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TOPIC 12 -Time & Dating - Time QuestionsaboutTime...

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