There is only one Greenwich Meridian (which I think is what you're asking about). It is the zero degrees line of longitude, so when a map location is given the longitude is given as being east or west of Greenwich. It position, going through Greenwich is partly historical and partly practical - opposite the meridian is the International Date Line, which for practical reasons is placed in the sea.
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An outlier pulls the median towards it. For example 1,2,3 Median=2 1,2,3,7 Median=2.5
it doesnt have a median.
There's is always going to be a median. Never is there not going to be a median.
Median is the middle value in a set of numbers. The median of 278 is 278.
There is not a median for 1 number.