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.
Longitude : latitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface. Longitude (shown as a vertical line) is the angular distance of a point east-west of the Prime(Greenwich) Meridian. Lines of longitude are termed as meridians.