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.
The latitude is preceded by a minus sign ( â ) if it is south of the equator (a positive number implies north), and the longitude is preceded by a minus sign if it is west of the prime meridian (a positive number implies east); for example, 37.68455Â° â97.34110Â°.