Each planet is linked to a sign of similar energy. Planets are centres of energy, whereas signs are ways in which this energy can be expressed. It is therefore a little dangerous to look for a one-to-one correspondence between the two. Nevertheless, most astrologers agree on the following connections:
| Planetary Rulerships | |
| Sign | Ruling Planet |
| Aries | Mars |
| Taurus | Venus |
| Gemini | Mercury |
| Cancer | The Moon |
| Leo | The Sun |
| Virgo | Mercury |
| Libra | Venus |
| Scorpio | Pluto |
| Sagittarius | Jupiter |
| Aquarius | Uranus |
| Pisces | Neptune |
Strictly speaking, a person's Ruling Planet is the planet which rules his or her ascendant sign. However, in practice, most people don't know their ascendant. In any case, our Sun Sign (the sign that the sun was in when we were born) has a more fundamental bearing on our whole character than our ascendant, which shows the "face" which we present to the world. It follows, therefore, that by looking at aspects to the Ruling Planet of our Sun Sign, we can understand how these energies are likely to affect us from day to day.