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DO Now

DO Now. List differences between latitude and longitude Why are there time zones on Earth? If it 2pm in New York State and California is 45 degrees west, what time is it in California?. Mapping the Earth. Measure the Earth.

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DO Now

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  1. DO Now • List differences between latitude and longitude • Why are there time zones on Earth? • If it 2pm in New York State and California is 45 degrees west, what time is it in California?

  2. Mapping the Earth

  3. Measure the Earth • Relationship between altitude of Polaris and a persons latitude in the Northern Hemisphere • The true shape of Earth • Observations of the sky are affected by Earth rotations

  4. Shape of the Earth • Perfect sphere- • Polar diameter equals equatorial diameter (PD=ED) • Earth has a slight bulge

  5. Oblate Spheroid • flattened slightly at the poles and bulging at the equator • Polar Diameter=12,715 km • Equatorial Diameter=12,756km • Therefore ED > PD

  6. Proof that Earth is an Oblate Spheroid • Photographs from space (most direct) • Altitude of Polaris (north star) • Polaris is almost located directly over the North Pole • As an observer travels north or south the altitude of Polaris changes

  7. POLARIS (AKA North star)

  8. More Proof 3. Gravitational Measurements • Differences in weight of an object at the equator and the poles 4. Early Observations • As a ship sails away from shore it appears to disappear from the bottom up

  9. Determine Polaris • Latitude is equal to the angle of Polaris in the Northern Hemisphere

  10. What is the latitude of the observer? • 10° North • 20° North • 40° North • 70° North

  11. Polaris • Is always north of the north pole • It is a celestial object • It circumvents the Earth

  12. Maps & Projections Latitude and Longitude

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