what does lines of latitude mean
The equator is zero degrees, the North Pole is 90 degrees north, and the South Pole is 90 degrees south, and in between is in between. Parallels, otherwise known as latitude lines, are lines that run across the Earth from east to west at a constant latitude. Everywhere on a parallel must have the same latitude. Your latitude can be calculated by measuring the angle of the sun. At the middle of the day on the equinox (when day and night are the same length) the angle of the sun below an upright line (a line straight up above your head) tells you your latitude.