The Prime Meridian is a line of longitude (0°). It goes through every north or south measurementbetween the north pole and the south pole, and no other lines of longitude cross it.
The Mississippi River meanders roughly south from its headwaters in Lake Itasca, Minnesota, at longitude 95 degrees west, to its mouth on the Gulf of Mexico at longitude 89 degrees west. . For the greater part of its length, it is within a hundred miles of longitude 90 degrees west.
The Arctic Ocean, the Arabian Sea, and the Indian Ocean, all cross the meridian of 60 degrees East longitude. It makes no difference where you are.
The Prime Meridian does cross parts of Mali.
Meridians of constant longitude cross parallels of constant latitude. Parallels of constant latitude cross meridians of constant longitude. At each intersection of a meridian and a parallel, the lines are perpendicular (form 90° angles).
The Prime Meridian is a line of longitude (0°). It goes through every north or south measurementbetween the north pole and the south pole, and no other lines of longitude cross it.
The Prime Meridian doesn't cross any territory of India.
The Mississippi River meanders roughly south from its headwaters in Lake Itasca, Minnesota, at longitude 95 degrees west, to its mouth on the Gulf of Mexico at longitude 89 degrees west. . For the greater part of its length, it is within a hundred miles of longitude 90 degrees west.
The Arctic Ocean, the Arabian Sea, and the Indian Ocean, all cross the meridian of 60 degrees East longitude. It makes no difference where you are.
-- Gulf of Guinea, south of Accra, Ghana -- Since everywhere on the equator is zero latitude, and everywhere on the Prime Meridian is zero longitude, the point that is common to both had better have the coordinates zero/zero .
Africa
The Prime Meridian does cross parts of Mali.
The point at which the equator (0° latitude) and the prime meridian (0° longitude) intersect has no real significane but it is in the Atlantic Ocean.
Meridians of constant longitude cross parallels of constant latitude. Parallels of constant latitude cross meridians of constant longitude. At each intersection of a meridian and a parallel, the lines are perpendicular (form 90° angles).
As you move east from the Prime Meridian, time increases by one hour for every 15 degrees of longitude you cross. This is because Earth rotates 360 degrees in 24 hours, so each hour represents 15 degrees of longitude.
Lines of equal Latitude run parallel (ie never cross) East-West (such as the Equator) Lines of equal Longitude (Meridian) run North-South and cross at the Poles.
At the observatory in Greenwich, UK, one of the cross-hairs in the eye-piece of an old telescope used by Isaac Newton marks the position of the Prime Meridian which is at zero degrees of longitude.