Latitude and Longitude
Lines of longitude run from the top of the Earth to the bottom. They are not parallel as lines of latitude are - they meet at a point at the north and south poles and. A (geographical) meridian (or line of longitude) is the half of an imaginary great circle on the Earth's surface, terminated by the North Pole and the South Pole. Cartographers and geographers trace horizontal and vertical lines called latitudes The Equator represents 0° latitude, while the North and South Poles represent They meet at both Poles, and specify the east-west position of a location.
Equator, Hemispheres, Axis, and Directions The earth rotates daily about its axis. The north and south poles are the two imaginary points where the axis would enter and exit from the earth if the axis were a pole or a line see Fig. The equatoris the imaginary primary reference line drawn around the earth halfway between the north and south poles.
The half of the earth to the north of the equator is the northern hemisphere; the half to the south is the southern hemisphere Fig. The prefix hemi- means "half"; thus, hemisphere means "half-sphere.
Movement toward the North Pole is northerly in direction.
Movement toward the South Pole is southerly in direction. Degrees of latitude are measured from an imaginary point at the center of the earth. If the earth was cut in half, this imaginary point would be intersected by a line drawn from the North Pole to the South Pole and by a line drawn from the equator on one side of the earth to the equator on the other Fig.
A radius is a line drawn from the edge of a circle to its center. To calculate the angle, draw a line from the point to the center of the earth and a line from the equator to the center of the earth Fig.One Of My Best Overlays, Plus The Importance Of 33 Degree Latitude
Parallels of latitude are imaginary reference lines that form complete circles around the earth parallel to the equator and parallel to each other.
The idea of having one prime meridian came from William Parker Snowbecause he realized the confusion of having multiple prime meridian locations. Many of theses geographical locations were traced back to the ancient Greeks, and others were created by several nations. Etymology[ edit ] The term meridian comes from the Latin meridies, meaning "midday"; the subsolar point passes through a given meridian at solar noonmidway between the times of sunrise and sunset on that meridian.
How the lines of latitude and longitude are drawn on a globe of - ProProfs
The same Latin stem gives rise to the terms a. Geographic[ edit ] The astronomic prime meridian at Greenwich, England. The geodetic prime meridian is actually Toward the ending of the 19th century there were two main locations that were acknowledged as the geographic location of the meridian, France and Britain. The position of the prime meridian has changed a few times throughout history, mainly due to the transit observatory being built next door to the previous one to maintain the service to shipping.
Such changes had no significant practical effect. Historically, the average error in the determination of longitude was much larger than the change in position. Impact of Prime Meridian Greenwich Time [ edit ] It was in the best interests of the nations to agree to one standard meridian to benefit their fast growing economy and production. The disorganized system they had before was not sufficient for their increasing mobility.
The coach services in England had erratic timing before the GWT. With a standard meridian, stage coach and trains were able to be more efficient.