To be under the sun means to be anywhere on earth, but in this context it is used to describe how her awareness dissipated until there was nothing left
Context: "Awareness of her body dissipated like fog nowhere on earth until there was nothing left but the brick wall and an incessant pounding against it."
Hypothesis: Awareness of her body dissipated like fog under the sun until there was nothing left but the brick wall and an incessant pounding against it.
Based on the context, is the hypothesis true, false, or unknown?