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| Time is a mystery as we know and use it in our daily lives. |
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| The study of time and its organzation into "usable units"- year, month, week, etc... |
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Eon, millennium, century, decade, year, month, week, day, hour, minute, second. |
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| 7 day week--Babylonians [7 heavenly bodies]: and jewish origins. |
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Start-end of the day-- t least FOUR ways: midnight to midnight, sunrise to sunrise, noon to noon, and sunset to sunset. |
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| Egyptians develop concept. |
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| Babylonians use base 60 math system; related to 360 degrees of circle. Names come from Romans. |
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| What is the organizational system in our culture? |
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| Gregorian calendar AKA Roman Catholic calendar. |
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| Name 3 types of calendars. |
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| The science and art of creating timekeeping devices. |
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1 type of timekeeping device |
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Definition
A. sunbased--"shadow clock" -Advantages: can be used day and night. -Limitations: Needs sun to work. |
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| 2 type of time keeping device |
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Definition
B. water clock--clepsydra -Advantages: can be used day and night -Limitations: works depending on tempature |
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3 type of time keeping device |
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C. mechanical -Advantages: can be used 24/7-- increasing accuracy -Limitaions: ??? |
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| 4 type of time keeping device |
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D. Electric driven clock -Advantages: can be used 24/7 and in all weather; increasing accuracy and require less attention. -Limitations: Need power to work |
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5 type of time keeping device |
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E. Atomis clock -Advantages: can be used 24/7 in all weather; some can be made quite smal with multiple functions; incrasng accuracy -Limitations: Need power to work |
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