how many lines  of longitude
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.