On 23 September the Sun enters Libra, the day of the autumn equinox: for one moment day and night last exactly the same, and for a month your energy shifts from acting alone to acting in relation to someone else.

What is happening

Libra is cardinal Air, the seventh sign, sitting at the exact middle of the zodiac: it closes the first half, where you learn to be yourself, and opens the second, where you discover yourself inside a relationship. With the Sun here your identity looks for confirmation in comparison with someone else more than in standing alone: you recognise yourself better when you measure up against someone who is not you.

Venus is at home here, but it works on beauty more than on immediate pleasure: you let go only once your critical eye has approved. Saturn is exalted, giving you a taste for justice and for agreements that last. Mars is in detriment and the Sun itself is in fall in this sign: these days personal instinct steps aside for shared reason, and acting alone, without agreement, costs you more than usual.

How to use it

Use this month for anything built between two people: an agreement, a collaboration, a relationship that needs rebalancing after a stretch where one side gave more than the other. The Sun in Libra gives you a sense of the right measure, more than you would have in a more individualist moment.

Where it pays to watch out is indecision replacing choice. These days the risk is standing still between two options just to avoid disappointing anyone, yourself included. Balance is not the sum of two equal halves: sometimes it means choosing clearly and accepting that someone, maybe you, comes out of it slightly unhappy.

Where you feel it most

If your Sun, Moon, Ascendant or Mercury is in Libra, or in one of the other Air signs (Gemini, Aquarius), you feel this transit directly: more oriented toward comparison than usual, and more exposed to indecision when the options seem to weigh the same. For everyone else, what matters is the house of your birth chart this Sun falls in: that is where you look for balance with someone else instead of moving alone this month.

Want to know which house it falls in and what that means for you specifically? Calculate your birth chart: all it takes is your date, time and place of birth.