The Range of Influence
Orb is the allowed margin of inexactness for an aspect how many degrees either side of exact the planets can be and still have the aspect be considered active. A conjunction with a 8° orb is considered valid even if the two planets are 7° apart. The tighter the orb, the stronger and more focused the aspect's expression. Most modern astrologers use 6–8° for major aspects between significant planets, and 1–3° for minor aspects.
Standard Orbs by Aspect
| Aspect | Typical Modern Orb | Traditional (Morin) |
|---|---|---|
| Conjunction | 8–10° | 8–12° |
| Opposition | 8° | 8–10° |
| Trine | 7–8° | 7–8° |
| Square | 7–8° | 7–8° |
| Sextile | 5–6° | 5–6° |
| Minor aspects | 1–3° | 1–2° |
Choosing Orbs in Practice
There is no universally agreed orb system practice varies by astrologer and tradition. As a general rule: tighter orbs give more precise, focused readings; wider orbs risk overcrowding the chart with aspects of questionable significance. For new students, start conservatively: 8° for conjunctions, 7° for oppositions and trines, 6° for squares, 5° for sextiles. As you develop sensitivity to aspects, adjust based on what you find most accurate in practice.