The full opposition
A Full Moon happens when the Moon swings opposite the Sun — a hundred and eighty degrees away, an opposition (two bodies facing each other across the chart). The whole lunar face is lit; the Full Moon rises in the east as the Sun sets in the west, stays up all night, and sets at dawn. Symbolically it is the cycle's peak — what was seeded in the dark is now fully shown — and the start of the turn toward release. The eight stages are in . Because the lights stand opposite, they always sit in facing signs, and that pair is what gives each Full Moon its charge.
The other person, lit up
This Full Moon shares the self-and-other axis with the but reads from the opposite end — and that reversal is the anchor. Here the Moon is in Libra and the Sun is in Aries, so it falls in Aries season, in spring. The Moon — the seat of emotional need — is in Libra, the sign of partnership; so what gets fully lit is the need for the other person. Libra is cardinal air, the reach toward balance, fairness, and the we. Across from it, the Aries Sun is cardinal fire, the will to act, the I. (The Full Moon in Aries lights the same axis from the self end; the contrast is the lesson.)
The rulers frame the night. The Libra Moon answers to Venus, planet of love and harmony; the Aries Sun answers to Mars, planet of the direct, solitary move. So a Venus-held Moon culminates against a Mars-held Sun: the longing to be met and treated fairly, brought to full light, while the Sun keeps insisting on independence and speed. This is why Libra Full Moons so often bring relationship needs to a head — the unmet wish for partnership becomes too bright to ignore.
Inhabiting the polarity
The work is not to choose the relationship over the self or the reverse. The Libra Moon is right that we are made in relation and that fairness matters; the Aries Sun is right that a self dissolved into pleasing others has nothing left to bring. The tension is the material. At the Libra end the failure is appeasement — going along, keeping the peace, swallowing the need until it curdles into resentment. At the Aries end it is the self-only move that treats the other person as an obstacle.
So let the real relational need surface — a Libra Full Moon will raise it whether you invite it or not — and speak it in Libra's register: fairly, with regard for the other side, but without erasing yourself to do it. What culminates here is the honest account of what you need from someone, finally lit brightly enough to say.