15 degrees E (15 degrees east) 30 degrees E (30 degrees east) and so on.
Longitude measures the distance east and west of the prime meridian.
15 degrees W (15 degrees west) 30 degrees W (30 degrees west) and so on.
The Prime Meridian
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 Equator runs east-west and the prime meridian runs north-south.
Longitude measures the distance east and west of the prime meridian.
15 degrees W (15 degrees west) 30 degrees W (30 degrees west) and so on.
You're on the right track, but don't get hung up on 'lines'. Longitude is the angle from the Prime Meridian east or west to the place of interest.
The Prime Meridian
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 right and left lines of a globe?" I assume the reference is to the lines of longitude? The Prime Meridian is zero longitude which is a line that passed through the Greenwich observatory, London, England. To the left is west. To the right is east.
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.
That depends on what you mean by "to the right of." If you are facing north, or if you are looking at a map that has north at the top, then the eastern hemisphere is to the right of the Prime Meridian.
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The north and south poles are the two endsof the Prime Meridian. So they're both on it.
Right now, it is 4:27 AM on Friday, January 24, 2014. Please don't blame me if this answer is wrong by the time you see it.