Closeness Centrality in R using igraph:

I'm looking for the closeness centrality readings from this graph:

g = graph(edges = c("a", "b", "b", "c", "b", "d", "c", "e", "d", "e", "d", "g", "e", "f", "e", "g", "e", "h", "g", "h"), directed = FALSE) 

This is what I used to get my results:

closeness(g) 

Here are the results:

a = 0.05263158

b = 0.07692308

c = 0.08333333

d = 0.09090909

e = 0.10000000

f = 0.06250000

g = 0.08333333

h = 0.06666667

How do I interpret these results? I'm not sure exactly what these numbers are saying. When i did the closeness centrality calculation by hand I got totally different numbers.