That's going to depend on how you're holding your map or globe.
-- If the north pole is at the top, then meridians to the left of the Prime Meridian
mark west longitudes.
-- If the south pole is at the top, then meridians to the left of the Prime one mark
east longitudes.
-- If the north and south poles are toward the sides of the map, then the Prime Meridian
is a horizontal line between them, and there is nothing on Earth to the left or right of it.
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.
15 degrees W (15 degrees west) 30 degrees W (30 degrees west) and so on.
The Equator runs east-west and the prime meridian runs north-south.
Because either way it would still be the same. There is only a maximum of 180 degrees longitude. If you move 180 degrees east and 180 degrees west, you will still end up at the same place, so there is no need to designate east or west for it.
By a W for West
The lines to the left of the prime meridian are negative.
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.
15 degrees W (15 degrees west) 30 degrees W (30 degrees west) and so on.
.
The Equator runs east-west and the prime meridian runs north-south.
By a W for West
Because either way it would still be the same. There is only a maximum of 180 degrees longitude. If you move 180 degrees east and 180 degrees west, you will still end up at the same place, so there is no need to designate east or west for it.
The longitude is below the equator and the latitude is to the left of the prime meridian
The prime meridian runs from the North Pole to the South Pole, so it goes up and down longitudinally.
Greenwich is a place in England. If you look at a map, places to the left are west of Greenwich and places to the right are east. A meridian is any line which runs from north pole to south pole and the meridian that runs through Greenwich is called the Greenwich Meridian and by definition is zero degrees. All other meridians are measured in degrees from zero. E.g. New York is -74 degrees, meaning it's west of Greenwich by 74 degrees.
It's the direction that's 143 degrees to the right of North, or 53 degrees to the right of East, or 37 degrees to the left of South. Those are all the same direction.
It'll be 90 degrees to your left.