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.