Measuring Time

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Measuring Time

• Effects of rotation

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Sundials
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Time Zone
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Time Zone
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Greenwich Mean Time

• At Prime Meridian
• London, Greenwich
• Standard time
• Starting point of every time zone
• See video

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Measuring Time

• Need longitude
• same longitude same time
• Longitude time difference from GMT x15
• Need time at one location
• Time difference longitude/15

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International date line

• Represents the longitude at which the date
  changes
• Opposite line from London
• Western half is a day behind

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Practice

• Which of those letters have the same latitude?
• Label your direction on the map. Where is East,
  Where is West?
• If its 6AM at point A, what time is it at point
  B?
• Its 5pm at point D, what time would it be at
  point E?

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Practice

• Label your directions. Where is west and where
  is East?
• It is 2am Thursday at point C, the time and date
  at point E would be?
• Is the time at point B ahead of point C? Why?
• The direction of Earths rotation is?

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Practice

• If it is 3p.m. Wednesday at point H, the time and
  date at point J are?
• If it is 5p.m Monday at Point F, the time and
  date at Point G are?