Symptoms include: 1  Itching. 2  Significant tearing and production of thick mucus. 3  The feeling of having something in the eye (foreign body sensation) 4  Aversion to light (photophobia)
Geographic coordinate system. Longitude lines are perpendicular to and latitude lines are parallel to the equator. A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are often chosen such that one of the numbers represents a vertical position, and two or three of the numbers represent a horizontal position.
Latitude and longitude. Lines of latitude [latitude: Imaginary lines around the Earth running parallel to the equator. These are measured in degrees north or south of the equator.] and longitude [longitude: Imaginary lines around the Earth running from the north to the south pole. These are measured in degrees east or west of the Greenwich or Prime Meridian.] are used to locate places accurately on the Earth's surface. Latitude.