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Longitude and Time

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  1. Longitude and Time

  2. Imagine clocks did not exist…..what would you base time on?

  3. Solar Noon Solar Time – Solar Noon – Sunrise Sunset

  4. What did the early clocks look like? Sundial

  5. Review Longitude Lines

  6. Do students in California get up when you get up for school?

  7. Time = Longitude!!

  8. Earth’s Rotation • Earth Rotates ___oin 24 hours • 360o/24hrs = __oper hour

  9. Standard Time Zones What is the amount of time difference between each time zone? • 1 hour • Every 15o longitude is a new time zone. • How many time zones are there? • 24 hours in one day… there are 24 time zones!

  10. Map of 24 Hour Time Zones

  11. Determining Longitude

  12. 1st: -

  13. A chronometer is a clock set to the local time at Greenwich, just outside of London.

  14. 2nd: -Local time best found at Solar Noon (12 noon) Sextant

  15. 3rd: Multiply by -0/hr

  16. 4th:- • If GMT is later in the day compared to local time – you are west • If GMT is earlier in the day compared to local time - you are east

  17. East sees daylight first! West last to see daylight! Prime Meridian Sun

  18. Example 1 • GMT = 2 pm • Local Time = 12 noon • What is your longitude? 2 hours*15° = 30° 2pm is later in the day than 12 noon - 30°W

  19. Prime Meridian 2pm 12pm The Prime Meridian is later in the day than local time.

  20. GMT = 8 am • Local Time = 12 noon • What is your Longitude?

  21. Final Question • GMT = 10 pm • Local Time = 12 noon • What is your Longitude? http://www.polleverywhere.com/multiple_choice_polls/NTc3NDc4NTY1/web

  22. Final Question • GMT = 10 pm • Local Time = 12 noon • What is your Longitude? -* -° =-° -