Longitude

Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface, or any celestial body. It is an angular measurement, typically expressed in degrees, and runs from 0° at the Prime Meridian (Greenwich, England) to +180° eastward and -180° westward. Lines of longitude, often referred to as meridians, are imaginary semicircles that connect the North and South poles. The intersection of longitude and latitude (north-south position) allows for precise pinpointing of locations. Its calculation is crucial for navigation, mapping, and understanding global time zones. Careful measurement of this parameter is essential for determining distances and locations. The concept helps define time zones and is fundamental in geospatial analysis.

Longitude meaning with examples

• The ship's navigator meticulously charted the longitude and latitude to ensure accurate course adjustments, combating strong ocean currents. Their accurate use of longitude was vital for their voyage, without this information, they would be lost at sea.
• Maps display lines of longitude, which helped cartographers locate towns, mountains, and rivers with precision. The longitude markers assisted explorers to stay aware of their position on Earth's surface; this allowed them to stay on course.
• Using a GPS device, the hikers could determine their exact longitude and latitude within a vast wilderness area, providing a safety measure as they explored; this allows them to send accurate position data if any emergency was to occur.
• Changes in longitude affect the local time, allowing for the creation of standard time zones; crossing the International Date Line, which follows the 180° line of longitude, causes a one-day shift in the calendar. This allows us to know and measure days properly.