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.
On these topographic maps the latitude and longitude units are expressed in degrees, minutes, and seconds. Each degree is subdivided into 60 minutes('). Each minute is divided into 60 seconds(''). Note the similarity to units of time which makes these relationships easy to remember.atitude of the top of the map is 40 30' and the latitude of the bottom of the map is 40 15'. The difference between these two is also 15'. This map, which covers an area that is 15' x 15' would be referred to as a 15 minute map. Notice that latitude and longitude is only fully written in the corners of the map.