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 measures how far north or south of the equator a place is located. The equator is situated at 0Â°, the North Pole at 90Â° north (or 90Â°, because a positive latitude implies north), and the South Pole at 90Â° south (or â90Â°). Latitude measurements range from 0Â° to (+/â)90Â°.Longitude measures how far east or west of the prime meridian a place is located.he equator is situated at 0Â°, the North Pole at 90Â° north (or 90Â°, because a positive latitude implies north), and the South Pole at 90Â° south (or â90Â°). Latitude measurements range from 0Â° to (+/â)90Â°. Longitude measures how far east or west of the prime meridian a place is located.