The four groupings the twelve signs fall into — fire, earth, air and water. Signs sharing an element are 120° apart and work in a compatible way, which is why the trine is the aspect between them. The element says what a sign is made of; the modality says what it does with it.
A transit between two signs of the same element arrives as agreement rather than pressure — the two ends of it want the same kind of thing.
the material a sign works in.
A trine is almost always same-element: Aries to Leo is one fire asking another for more of itself.
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