Geology Study of the Earth, its systems and processes

Together, latitude and longitude can be used as a geographic coordinate system to specify any location on the globe.

Latitude-AKA Parallels (90N to 90S)

- drawn East & West, but are counted North & South.

- “climb the latitude ladder”

- Equator = 0, Poles = 90

- SAHS is located at 40°17'53"N

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Longitude-AKA Meridians(0 to 180)

- drawn North & South, but are counted East & West.

- Prime Meridian = Greenwich, Eng = 0- 180 = Int’l Date Line

- the Earth rotates 15 of longitude every hour, therefore, it takes 24 hours for the Earth to rotate 360.

- SAHS is located at 75°21'20W

The Earth can then be segmented into hemispheres:

Northern hemisphere

Southern hemisphere

Western hemisphere

Eastern hemisphere

• There are 60 minutes in a degree• There are 60 seconds in a minute

Minutes and seconds are used for finer measurements

SAHS is located at the coordinates: 40°17'53"N, 75°21'20W

GPS – Global Positioning System

Using triangulation, a GPS receiver is able to calculate PTEDS" on earth

positiontime

elevationdirection

speed

A space based global positioning system that provides reliable location and time information in all weather anywhere on Earth when 3 or more GPS satellites are within sight.

It is operated by the US government and available free to anyone with a GPS receiver .

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