the story of longitude the greatest intellectual puzzle of the 16 th and 17 th centuries
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Latitude & LongitudeTRANSCRIPT
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The Story of The Story of LongitudeLongitude
The Greatest Intellectual The Greatest Intellectual Puzzle of the 16Puzzle of the 16thth and 17 and 17thth
CenturiesCenturies
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What Are We Doing?What Are We Doing?
Content Area StudyCross Discipline Unit
Social Studies is Everything!Using Technology for
DifferentiationFirst, a Story
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Latitude & LongitudeLatitude & Longitude
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Latitude is Easy to FindLatitude is Easy to Find
The angle of the sun over the horizon on any given day is directly related to the location one is viewing from.
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Determining LatitudeDetermining Latitude
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Was Chris Really Taking a Was Chris Really Taking a Chance?Chance?
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Columbus would have used a magnetic compass, a speed log, and a logbook.
He was what we now call a dead reckoning navigator.
Because he could NOT determine longitude,his course would have looked like this:
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We Understand Latitude -But What About Longitude?
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Longitude is a Longitude is a Measurement of TIME Measurement of TIME translated to DEGREEStranslated to DEGREES
Longitude - measuredLongitude - measuredin minutes, secondsin minutes, seconds
1 degree=60 minutes=1 degree=60 minutes=69 miles69 miles
1 second=1.15 miles (eq)1 second=1.15 miles (eq)
So, put it togetherSo, put it together
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Location is Now a GridLocation is Now a Grid
Expressed in degrees N or S of the equator – Latitude &
degrees E or W of Greenwich (Prime Meridian)-Longitude
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But the Devil is in the But the Devil is in the DetailsDetails
• In 1700, there was no accurate way to In 1700, there was no accurate way to measure time.measure time.
• In order to be practical, time In order to be practical, time measurement must be accurate to measurement must be accurate to within a few seconds every month.within a few seconds every month.
• A time keeping device must function A time keeping device must function perfectly on a sailing ship at sea – in the perfectly on a sailing ship at sea – in the most corrosive atmosphere possible.most corrosive atmosphere possible.
Enter John Harrison, clockmakerEnter John Harrison, clockmaker
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Harrison’s Successful Chronometer – H4
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Time at the Prime Meridian
Less local time measured at Noon =
Longitude
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Now, English Ships Could Travel Diagonally
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H4 – A Technological H4 – A Technological AdvancementAdvancement
Led to….Led to….• Superior English NavigationSuperior English Navigation• English Mastery of the SeasEnglish Mastery of the Seas• Establishment of a World Wide EmpireEstablishment of a World Wide Empire• Fundamental Shift in the World’s Power Fundamental Shift in the World’s Power • Alteration of World History…..andAlteration of World History…..and• Made our World Made our World
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How Do You Teach What You Just How Do You Teach What You Just Heard?Heard?
• Content Area Mastery is KeyContent Area Mastery is Key
• Cross-Discipline Integration ReinforcesCross-Discipline Integration Reinforces Reading, Math, Science & Social StudiesReading, Math, Science & Social Studies
Social Studies is Everything!!Social Studies is Everything!!
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What Have We Done?What Have We Done?
Content Area StudyCross Discipline Unit
Social Studies is Everything!Now,
Using Technology for Differentiation
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Unit Planning Across Disciplines
Differentiation Using
Technology
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