72 number of meridians can be drawn on the globe at 5 degree interval
20
The prime meridian
The Prime Meridian is complete just the way it's drawn on maps or globes. It's not missing anything. When the Prime Meridian is joined with the 180° meridian of longitude, the combination forms a single, complete great-circle.
The International Date Line forms a great circle with the Prime Meridian. A great circle is the largest possible circle that can be drawn around a sphere.
The International Date Line runs roughly along the 180° longitude, (opposite the Prime Meridian), but it is drawn with diversions to pass around some territories and islands.
A Meridian or Meridian Line is an imaginary line drawn between two points. In geography these two points are an imaginary arc on the earths surface from the North to the South Poles. In astronomy it is an imaginary circle in a perpendicular plane to those planes of the celestial equator and horizon.
there is an interval of 5 ex. 0, 5 , 10, 15, 20...
The prime meridian is located at 0 degrees longitude and passes through Greenwich, England. The international dateline is located at 180 degrees longitude and is opposite the prime meridian, roughly along the 180th meridian in the Pacific Ocean.
The international date line roughly follows the 180o meridian down the middle of the pacific ocean.
They are imaginary lines drawn on spheres such as the earth, sun, moon, planets to simplify the location of points of interest.
lines of longitude are lines drawn north and south and measure east and west a famous line of longitude is the Prime meridian