Square · 90° apart
Square
Same modality, clashing elements. Genuine friction, and genuine momentum: this pairing produces change, not comfort.
Water · Cardinal · ruled by Moon
Brings. Reads emotional undercurrents accurately and looks after people without being asked.
Struggles with. Withdraws instead of stating the problem, and keeps score in silence.
In love. Slow to open, fiercely loyal once it does. Takes small slights harder than it admits.
Air · Cardinal · ruled by Venus
Brings. Sees every side of a dispute and can make opposing parties feel heard.
Struggles with. Avoids decisions to avoid disappointing anyone, which disappoints everyone eventually.
In love. Partnership-oriented to the core. Uncomfortable alone, sometimes to its own cost.
Cancer is cardinal water; Libra is cardinal air. Sharing a modality means handling change the same way, which sounds helpful and often means competing for the same role.
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 1.527% of all possible pairings, which ranks 6 of 78.
12 of the 78 pairings form the same square. 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.