Trine · 120° apart
Trine
Same element. The smoothest combination in the zodiac — mutual understanding without translation, at the risk of never being challenged.
Fire · Mutable · ruled by Jupiter
Brings. Genuinely open-minded and hard to discourage. Says the thing nobody else will.
Struggles with. Says it without checking whether it needed saying, and leaves before the consequences land.
In love. Needs room and honesty. Reads possessiveness as a threat rather than devotion.
Fire · Cardinal · ruled by Mars
Brings. Starts things other people are still discussing. Recovers from setbacks faster than almost any other sign.
Struggles with. Bores quickly, interrupts constantly, and treats patience as a personal insult.
In love. Pursues openly and dislikes ambiguity. Wants a partner who can hold their own ground rather than yield.
Sagittarius is mutable fire; Aries is cardinal fire. Sharing an element means sharing a temperament — you process things the same way, which removes most of the translation work.
Sun signs are one factor among many, and astrology itself treats them as a starting point rather than a verdict. Two full charts describe far more than two birthdays do.
Computed, not asserted
Zodiac signs are not equally common — the Sun spends different amounts of time in each, so some pairings occur far more often than others. This one is 1.309% of all possible pairings, which ranks 50 of 78.
12 of the 78 pairings form the same trine. Worth knowing before treating this aspect as a distinguishing feature of your relationship — a sixth of all couples share it. Note also the rising times: at London’s latitude these two signs spend very different amounts of time on the ascendant, which is why one of them turns up as a rising sign far more often than the other. The full table is here.