Cazimi

A planet within 0° 17′ of the Sun’s longitude is said to be “in the heart of the Sun” – or Cazimi. Ancient authorities deemed that it fortified the planet as much as a Combust position debilitated it; but modern authories generally ignore the distinction and classify it as combust, imparting to the nature, a one-track viewpoint on all matters appertaining to the planet so placed.

DeVore, Nicholas. Encyclopedia of Astrology. New York: Philosophical Library, 1947.