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Diagram showing dexter and sinister aspects.

Dexter literally means ‘of the right’ and refers to something on the right hand side; sinister means ‘of the left’ and refers to something on the left hand side. According to Pythagorean principles, movement towards the right is more natural and direct than movement towards the left (hence the term ‘righteous’ or the negative undertones given to the word ‘sinister’ generally). This partly recognises the influence of diurnal motion (by which planets move from left to right), and the fact that in any cycle between two planets, the faster moving planet will cast its aspect to the other on the right hand side whilst the cycle is waxing (suggesting growth and vigour), and to the left hand side when the cycle is waning (suggesting retirement and weakness). A ‘dexter aspect’ is therefore said to be more forceful and effective than a sinister one. Dexter aspects are formed in keeping with diurnal revolution (for example, a planet in Pisces applying to a sextile of a planet in Capricorn); sinister aspects are formed against diurnal revolution (for example, a planet in Pisces making a sextile to a planet in Taurus).

» Glossary of terms