This is the melody. You'll need to experiment to get thew rythm right.
[ Tab from: https://www.guitartabs.cc/tabs/v/van_morrison/moondance_tab_ver_2.html ]
e----------------------------------------------------------------------------|
B-----0-1-0---0-----------0-1-0-----0----------------------------------------|
G---2-------2---2-0-2---2-------2-0---0---0----------------------------------|
D-2-------------------2-----------------2------------------------------------|
A----------------------------------------------------------------------------|
E----------------------------------------------------------------------------|
just repeat that for a while!
