Sun aspects in natal chart reveal quality of light, challenges, to realize the soul's purpose.
Mercury square Mars
Birth Chart Aspect: Mercury square Mars
Sun Square Saturn
Sun square Saturn in the birth chart.
Mercury Square Mars
A look at this natal aspect -- Mercury square Mars -- in the birth chart.
Skycript UK's Michael McClain -- expertly drawn interpretations for Pluto aspects (to planets in birth cahrt).
Sun Aspects - Share Your Most Outstanding Sun Aspect
Astro Swap Meet - Share Your Most Outstanding Sun Aspect
Introduction to Aspects
A short intro to aspects, the angles between planets and what they signify.
Aspects - The Relationship Between Planets
A handy reference on planetary aspects from Astrodienst.