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Maps

Maps. Peterson. Ptolemy. 1100 AD. Mercator 1500s. Sextant to determine latitude. John Harrison Late 1700s. 360° / 24 hours in a day = 15° Earth rotates 15° every hour Keep chronometer on GMT (0°) Compare current sunrise / sunset to tables of sunrise/sunset at Greenwich.

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Maps

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  1. Maps Peterson

  2. Ptolemy

  3. 1100 AD

  4. Mercator 1500s

  5. Sextant to determine latitude

  6. John Harrison Late 1700s

  7. 360° / 24 hours in a day = 15° Earth rotates 15° every hour Keep chronometer on GMT (0°) Compare current sunrise / sunset to tables of sunrise/sunset at Greenwich. If sunrise at 8 AM. Sunrise at Greenwich at 6 AM Longitude = 30° W

  8. Mollweide Equal-area

  9. 12 inches in a foot 5280 feet in a mile 63,360 inches in a mile RF 1:24,000 How many miles to an inch? 24000/63000 = 0.378 1 in : 0.378 miles RF 1:100,000 How many inches in a mile ? 100,000 / 63,360 = 1.5782 1 in: 1.5782 miles 100 cm in a meter 1000 meters in a KM 100,000 cm in a KM RF 1:24,000 How many KM to a cm? 24000/100,000 = 0.24 1 in : 0.24 KM RF 1:100,000 How many KM to a cm? 100,000 / 100,00 = 1.0 1 cm: 1 KM

  10. GIS

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