Longitude

Longitude is the distance measured in degrees, minutes and seconds, from any point on Earth's surface and the meridian 0 (Greenwich).

It is measured east or west. Its value is between 0 and 180 degrees.

Longitude

Longitude and latitude. Press the buttons
Lenni Armstrong, Informmotion/NOAA http://serc.carleton.edu

Global Positioning Systems

"Determination of location in field conditions was once a difficult task. In most cases, it required the use of a topographic map and landscape features to estimate location. However, technology has now made this task very simple. Global Positioning Systems (GPS) can calculate one's location to an accuracy of about 30-meters. These systems consist of two parts: a GPS receiver and a network of many satellites. Radio transmissions from the satellites are broadcasted continually. The GPS receiver picks up these broadcasts and through triangulation calculates the altitude and spatial position of the receiving unit. A minimum of three satellite is required for triangulation." www.physicalgeography.net

Latitude

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© Jorge Juan Lozano Cámara, profesor del IES Juan de la Cierva de Vélez-Málaga
Licenciado por la Universidad de Granada (España)  

Ana María Marcos Sánchez, profesora del IES Juan de la Cierva de Vélez-Málaga
Licenciada por la Universidad de Málaga (España)

Kerry Elyse Hart, Licenciada por la Universidad de Richmond (Virginia, USA)