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.
The Earth is still divided equally into 360Â° of longitude with 180Â° being east of the Prime Meridian and 180Â° west. Longitudinal coordinates are divided into degrees, minutes and seconds with 60 minutes making up a degree and 60 seconds comprising a minute. For example, Beijing, China's longitude is 116Â°23'30E. The 116Â° indicates that it lies near the 116th meridian while the minutes and seconds indicate just how close it is to that line. The E indicates that it is that distance east of the Prime Meridian.