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 refers to the angular distance measured north and south of the Equator, while longitude is the angular distance calculated east and west of the Prime Meridian. The Equator is 0 degrees latitude, while the Prime Meridian is 0 degrees longitude. Learn more about Maps & Cartography