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.
Lesson Summary. Latitude is the angular distance of a place north or south of the Equator in degrees. A latitude of zero degrees is on the Equator of the Earth. Ninety degrees north is the North Pole, and 90 degrees south is the South Pole. Longitude is the angular distance of a place east or west of the meridian at Greenwich, England. With these two numbers, any point on the Earth's surface can be located.