In astrology, aspects between planets or advanced points are given a margin in which they have an influence. For example, although the trine aspect is 120°, two planets that are 125° (or 115°) apart are still considered to be in trine aspect.
Based on the type of horoscope (natal, solar, transit,...) we use the recommended orbs as following:
Natal Horoscope
Conjunction: 0° +/- 8°
Opposition: 180° +/- 8°
Trine: 120° +/- 8°
Square: 90° +/- 8°
Sextile: 60° +/- 6°
Inconjunct: 150° +/- 4°
Transit Horoscope
Conjunction: 0° +/- 2,6°
Opposition: 180° +/- 2,5°
Trine: 120° +/- 2,3°
Square: 90° +/- 2,3°
Sextile: 60° +/- 2,3°
Synastry Horoscope
Maximal 5 degrees for conjunctions and oppositions with Sun and Moon.
Maximal 3 degrees for other aspects which are related to Sun or Moon (trine, square, sextile).
Maximal 3 degrees for other planets (Mercurius to Pluto).
Solar Return and Lunar Return Horoscope
Maximal 6 degrees of orbs is taken into account.
Composite Horoscope
An orb of 2,5 degrees is taken into account.
Secondary progressions
We use very tight orbs (1°) for Secondary Progressions.
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