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 measure distances on the earth's surface in degrees. Latitude and longitude start with two lines: the equator and the prime meridian. Latitude measures the distances north or south from the equator. Longitude measures distances east and west from the prime meridian. Every place in the world has its own latitude and longitude.