Insolation /(?)/

In·so·la·tion

Insolation

n.
  1. The act or process to exposing to the rays of the sun for the purpose of drying or maturing, as fruits, drugs, etc., or of rendering acid, as vinegar.
  2. A sunstroke. (Med.)
  3. The amount of sunlight impinging on the Earth's surface. (Meteorology)