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Time

Time. All measurements of time are based directly on the apparent movements of the sun. Solar noon : when the sun is centered at its highest point in the sky on that day. Solar Day : the time from one noon to the next noon (midnight to midnight actually measures one day).

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Time

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  1. Time

  2. All measurements of time are based directly on the apparent movements of the sun.

  3. Solar noon: when the sun is centered at its highest point in the sky on that day.

  4. Solar Day: the time from one noon to the next noon (midnight to midnight actually measures one day)

  5. For convenience we have adjusted the day to 24 hours, although it is a little less

  6. The Basis of the Time Zone: • The Earth like all circles is 360˚ around • The Earth spins 360˚ in one day (24 hours) • If we divide 360˚ by 24 hours in a day, we get 15˚ for every hour

  7. The basis of Time Zones • Since the Earth moves 15˚every hour, Earth is divided into 24 time zones that are 15˚ of longitude apart.

  8. Time Zones • For convenience sake, states and countries do not always divide the time zones directly along the lines of longitude

  9. Think about this… • Earth Rotates counterclockwise (so that means it rotates West to East) • This means that the EAST experiences the day first… • Time zones to the east are later in the day then time zones in the west

  10. Time Zone Problems!! 1.  If the time was 12:15 am in Los Angeles, California what time would it be in Bow, New Hampshire? 2.  If it was 9:00 p.m. in New Hampshire, what time would it be in Miami, Florida? 3.  About how many time zones would you pass through if you traveled 190 degrees around the earth?

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