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Time

Time. Absolute Time. Is a precise measurement. Can refer to specific events, dates or moments. Uses numbers and is exact. Examples. Mrs. G was born on May 11, 1978. The power went out at 5:23 and 6 seconds. The bank opens at 9:30. Relative Time.

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Time

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  1. Time

  2. Absolute Time • Is a precise measurement. • Can refer to specific events, dates or moments. • Uses numbers and is exact.

  3. Examples • Mrs. G was born on May 11, 1978. • The power went out at 5:23 and 6 seconds. • The bank opens at 9:30.

  4. Relative Time Is time measured in relation to other things

  5. Examples • Mrs. G was born during the era of big hair • The power went out during Seinfeld • The bank opens at the same time as the mall

  6. Man and Measuring Time Throughout history, man has devised many ways of keeping time Examples: • Sundial: A device for telling time of day by the shadow which sunlight produces on the instrument.

  7. Ropes: When burned, knots tied at regular intervals would measure time. • Candles: The candles would have grooves carved into them and, when burned, each groove represented a specific amount of time.

  8. Hourglass: It tells time by means of sand trickling through a narrow opening. • Water Clock: It measures time by allowing water to drip from one marked container into another.

  9. Mechanical Clocks: They were invented in 1656.

  10. Cyclical Time and Linear Time Cyclical Time • Based on the cycles of nature. • Repeats over and over in a cycle. • Is a measurement of natural cycles and is an attempt by humans to live in harmony with the cycles of nature.

  11. Cyclical Time cont’d • Days – are based on the rising and setting of the sun. • Months – are based on the cycles of the moon. • Years – are based on the Earth’s cycle around the sun.

  12. Three examples of cyclical time measurement: Stonehenge: Is located on the Salisbury Plain in southern England. Allowed for some measurement of cyclical time.

  13. 2. Medicine Wheels: • Are found on the prairies of North America. • Were built by the Plains Indians. • Were mostly used as calendars.

  14. 3. Calendars: • Were designed to measure time and organize society. • The first calendar used in the western world was the Julian calendar which was introduced by Julius Caesar. • In 1582, Pope Gregory XIII developed the Gregorian calendar, which replaced the Julian calendar.

  15. Linear Time: • Is a measurement invented to use in long range planning. • Can be plotted on a timeline. • Always has a beginning and an end.

  16. Three examples of linear time measurement: 1. Personal Time: • Is time reflected by the life span of an individual person. • Includes events such as birth, graduation, and marriage. • Is measured in days, months, and years.

  17. 2. Historical Time: • Is time since people began keeping records of historical events. • Includes important political, social, and economic events. • Is measured in years, decades, centuries. • Remember: B.C. means “Before Christ” and A.D. means “Anno Domini” (In the Year of Our Lord).

  18. 3. Geological Time: • Is time reflected by the age of the Earth. • Includes periods in the Earth’s geological development and the development of life on Earth. • Is measured in epochs, periods, and eras.

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