The geometry of the heavens

The Five Major Aspects

Aspects are the angles the wandering planets strike against one another across the wheel of a nativity. Where two lights stand sixty, ninety, or a hundred and twenty degrees apart, the ancients drew a chord between them and listened to its tone — some chords harmonious, some dissonant, all of them music. Five great angles compose nearly all of a chart's conversation.

Conjunction

0°

Neutral

Two planets stand in the same degree of sky, their lights fused into a single flame. The conjunction is union — potent, undiluted, and impossible to ignore.

Sextile

60°

Harmonious

At sixty degrees apart, two planets exchange friendly glances across compatible elements. The sextile is opportunity — a door left ajar, waiting for a willing hand.

Square

90°

Challenging

Ninety degrees of tension set two planets at cross purposes, each demanding its due. The square is friction — the whetstone upon which character is sharpened.

Trine

120°

Harmonious

At a hundred and twenty degrees, two planets flow within the same element, effortless as a river finding the sea. The trine is grace — talent given freely by the heavens.

Opposition

180°

Challenging

Two planets face each other across the full diameter of the sky, each the other's mirror. The opposition is polarity — awareness born of standing at opposite shores.