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In geography and geodesy, a meridian is the locus connecting points of equal longitude, which is the angle (in degrees or other units) east or west of a given prime meridian (currently, the IERS Reference Meridian). [1] In other words, it is a line of longitude.
Meridian, imaginary north–south line on the Earth’s surface that connects both geographic poles; it is used to indicate longitude. The 40th meridian, for example, has a longitude of 40° E or 40° W.
Longitude is measured by imaginary lines that run around Earth vertically (up and down) and meet at the North and South Poles. These lines are known as meridians. Each meridian measures one arc degree of longitude. The distance around Earth measures 360 degrees.
Lines of longitude, also called meridians, are imaginary lines that divide the Earth. They run north to south from pole to pole, but they measure the distance east or west. Longitude is measured in degrees, minutes, and seconds.
Latitude and longitude, coordinate system by means of which the position or location of any place on Earth’s surface can be determined and described. Latitude is a measurement of location north or south of the Equator. Longitude is a similar measurement east or west of the Greenwich meridian.
They are commonly referred to as meridians of longitude, or simply meridians. The zero meridian, or base line for numbering the north-south lines, is called the prime meridian. Each meridian goes only halfway around the Earth—from pole to pole.
Because longitude lines are not parallel, they are known as meridians. Like parallels, meridians name the specific line and indicate the distance east or west of a 0° line. Meridians converge at the poles and are farthest apart at the equator (about 69 miles (111 km) apart).
The longitude of a particular location is the distance along a parallel, measured in degrees, between that place and the prime meridian. The prime meridian passes through the old Royal Observatory at Greenwich, England, and is sometimes referred to as the Greenwich meridian.
Circles of Latitude are called parallels while half of a longitudinal circle is called a Meridian. Meridians are important for setting time zones. There are five main parallels that are useful to explain the correlation between the Earth, the Sun, and climate. As such, these five main parallels also mark the five geographical zones. These are:
Longitude is a system of imaginary north-south lines called meridians. The Earth is a spinning sphere, or ball. The center of the spin is a line called the Earth’s axis. The axis meets the Earth’s surface at two points – the North Pole and the South Pole.