Lecture3 latlongpost

Announcements ,[object Object],[object Object]

Welcome to Earth You are here Inner/ Rocky Outer/Gaseous No longer a planet SUN

[object Object],[object Object],Does this seem weird to you? Earth’s Elliptical Orbit This drawing is very misleading!

The Earth is Round An Oblate Ellipsoid ,[object Object],[object Object],21 km difference

The Earth is Round An Oblate Ellipsoid ,[object Object],[object Object],[object Object]

The Geographic Grid System ,[object Object],[object Object]

[object Object],[object Object],latitude = angle; parallel = line Latitude

Latitude The Oregon Boundary Dispute The 49 th Parallel The 42 nd Parallel Fifty-four Forty or Fight!

[object Object],[object Object],longitude = angle; meridian = line Longitude

Royal Observatory, Greenwich England Prime Meridian

100 th Meridian Longitude Beyond the Hundredth Meridian Wallace Stegner

Measuring lat and long ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Infrared Aerial Photo 200 m 37˚ 16’ 12” N 76˚ 42’ 42” W 2” 9”

Finding your position on the global coordinate system ,[object Object],Azimuth/Bearings: North = 0˚ or 360˚ East = 90˚ South = 180˚ West = 270˚

[object Object],[object Object],Finding your position

[object Object],[object Object],[object Object],Finding your position

[object Object],[object Object],Finding your position x Cape Point Mt. Owens x N 1 km 058 o

[object Object],[object Object],[object Object],Finding your position x Cape Point Mt. Owens x N 1 km 327 o

[object Object],[object Object],[object Object],[object Object],Finding your position

But how do you find yourself when land cannot be seen?

Finding your position Sure, now we’ve got GPS and radar. But how on Earth did the English find Jamestown over and over again? Use the stars to find your Latitude Use time to find your Longitude

Astrolabe Sextant Latitude from the Stars

[object Object],[object Object],[object Object],[object Object],Latitude from the Stars North Star North Pole Equator Latitude = 90 ° Horizon

[object Object],[object Object],[object Object],[object Object],Latitude from the Stars North Star North Pole Equator Latitude = 0 ° Horizon

[object Object],[object Object],[object Object],Latitude from the Stars North Star North Pole Equator Latitude = x ° Horizon x

World Time Zones Longitude from the Time

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Longitude from the Time

How many degrees of longitude constitute a time zone? ,[object Object],[object Object],Longitude from the Time

putting it into practice Longitude from the Time

If 1 hour = 15 ° what does 1 minute equal? Longitude from the Time -divide each side by 60- 1 min (time) = 15 min (longitude) How’s that for confusing?

Lecture3 latlongpost

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