longitude and time. imagine clocks did not exist…..what would you base time on?
TRANSCRIPT
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Longitude and Time
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Imagine clocks did not exist…..what would you base
time on?
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Solar Time – Solar Noon –
Sunrise
Solar Noon
Sunset
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What did the early clocks look like?
Sundial
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Review Longitude Lines
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Do students in California get up when you get up for school?
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Time = Longitude!!
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Earth’s Rotation
• Earth Rotates ___o
in 24 hours
• 360o/24hrs = __o per
hour
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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!
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Map of 24 Hour Time Zones
•
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Determining Longitude
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1st: -
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A chronometer is a clock set to the
local time at Greenwich, just
outside of London.
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2nd: - Local time best found at Solar Noon (12
noon)
Sextant
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3rd: Multiply by -0/hr
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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
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Prime Meridian
East sees daylight first!
West last to see daylight!
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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
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Prime Meridian
The Prime Meridian is later in the day than local time.
2pm
12pm
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• GMT = 8 am• Local Time = 12 noon • What is your Longitude?
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Final Question
• GMT = 10 pm• Local Time = 12 noon • What is your Longitude? http://www.polleverywhere.com/multiple_choice_polls/NTc3NDc4NTY1/web
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Final Question
• GMT = 10 pm• Local Time = 12 noon • What is your Longitude?
-* -° = -°-