There are several differing definitions of the sun graph. ISGCI defines a (complete) 
-sun graph as a graph on 
nodes (sometimes also known as a trampoline graph; Brandstädt
et al. 1987, p. 112) consisting of a central complete
graph 
with an outer ring of 
vertices, each of which is joined to both endpoints of the closest outer edge of
the central core.
Wallis (2000), Anitha and Lekshmi (2008), and the American Institute of Mathematics use the term "
-sun"
graph to instead refer to the graph on 
vertices obtained by attaching 
pendant edges to a cycle graph 
. These graphs are referred to as "sunlet graphs" by ISGCI. The 3-sunlet graph 
is also known as the
net graph.
The sun graphs are pancyclic and uniquely Hamiltonian.
The bipartite double graph of the sun graph 
for 
odd is 
.
