-- Tell others where you are, or keep a record of it.-- Decide how to get from where you are to where you want to be.
They are used to locate a certain place on a map.
Longitude is based on the Prime Meridian. It is a vertical line running from the north to south pole running through the Royal Observatory in Greenwich, east London, UK . It is 0ยบ longitude.
Any place on Earth where your "absolute" location is desired.
latitudes are a set of lines running from east to west and longitudes are a set of lines running from north to south.They are always equal.