There are 24 x 60 = 1440 minutes in one day (24 hours)
Therefore there are 1440 meridians at one minute intervals.
72 number of meridians can be drawn on the globe at 5 degree interval
20
The prime meridian
If drawn on a globe at intervals of one degree, there would be 178 lines and two points.
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.
Most world maps are drawn with the Prime Meridian at or near the center and the International Date Line at or near the left and/or right edge(s).
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.
it is 300 degrees interval
there is an interval of 5 ex. 0, 5 , 10, 15, 20...
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.