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The lines to the left of the prime meridian are negative.
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 runs from the North Pole to the South Pole, so it goes up and down longitudinally.
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 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 right line on a globe is the Prime Meridian, located at 0° longitude, and the left line is the International Date Line, roughly at 180° longitude. The Prime Meridian represents the starting point for measuring longitude, while the International Date Line marks where the date changes as you travel east or west across it.
By a W for West
The longitude is below the equator and the latitude is to the left of the prime meridian
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.
Actually, the equator divides the Earth in North and South hemisphers. And is not a subjective "cut" of the Earth. South from the Equator, the polarity of the Earth is reversed from the northern hemisphere. (Water goes down in a sink from right to left in the north and from left to right in the south) While the prime meridian is a virtual and subjective line created just to be a time reference. But there is no "physical" difference between the East and the West. The Prime meridian could be any parallel lines linking north Pole to South pole.
Longitude is up and down latitude goes left and right . Hope this helped.==============================To put a finer point on it:The answer to that question depends on how you hold your mapor mount your globe.The longitude of any place is the angle east or west between thatplace and the Prime Meridian.