Look at a map in any atlas.
0.22° south latitude 78.49° west longitude
lines of latitude
latitude?
Each 'meridian' is a line of constant longitude.
Every meridian of longitude is perpendicular to every parallel of latitude, and every parallel of latitude is perpendicular to every meridian of longitude.
Latitude.
Latitude and longitude
The lines that intercept latitude lines are lines of longitude.
Longitude lines go vertically and latitude lines go horizontally.
Every parallel of latitude crosses every meridian of longitude.
Lines of latitude and longitude allows any position on the Earth to be plotted.
Lines of Longitude