Western astrology commonly treats planets as functions of the psyche and behavior. The Sun points to identity, the Moon to emotional needs, Mercury to communication, Venus to relating, and Mars to drive. The outer planets add longer collective themes in many modern approaches.
A planet’s sign shows how it behaves, and its house shows where that behavior appears. The aspects to other planets then reveal whether the function is integrated smoothly or works through tension and effort.
Personal planets
The Sun, Moon, Mercury, Venus, and Mars are often called the personal planets because they shape everyday identity, need, speech, attraction, and action. These planets create much of the familiar personality pattern people notice first.
Social and structural planets
Jupiter and Saturn are frequently read as planets of growth and structure. Jupiter opens horizons, while Saturn tests what can endure. Together they show whether a person tends to expand first and consolidate later, or hold back until the structure feels safe.
Aspects complete the picture
A Venus in Libra may prefer harmony, but if it squares Saturn the person may still feel guarded in relationships. This is why planetary meanings are only fully useful when the aspect pattern is included.