I don't know whether this sun v shade topic is a continuation of the varroa
in hot climates discussion but the reason I mentioned the positioning of the
hives was that I suspected that the temperature of the hives was being
controlled by placing them in the shade.  There was some discussion a while
ago about varroa being temperature sensitive and I wondered if, by exposing
the hives to full sunlight in hot climates (possibly for only a short time
each day) there would be any effect on the varroa infestation.
Harry
(Not much point in  me trying this experiment as I don't think I have seen
the sun this year!!)