Planets in SignsSun in Aries: What It Means in a Birth Chart
Sun governs identity and purpose, and Aries is a fire sign in cardinal mode. Sun is in exaltation here. Here is what the placement does, its shadow, and the real dates Sun is in Aries.
Moon Signs
Libra Sun aims to be fair, and to make things work between people; Aries Moon needs to act on a feeling immediately, and to not be managed. The two signs are opposite each other, which is what decides whether those two agree, and it also tells you the lunar phase you were born under.

The Sun is the aim. Not what you are like, which is a different question, but what you are consciously oriented toward and what you would be proud of being. With the Sun in Libra that is to be fair, and to make things work between people.
What Libra quietly takes pride in is decency. At its best this placement becomes somebody other people trust to hold the middle. Libra is Air and Cardinal, ruled by Venus, and the recognised weak spot is that it keeps the peace at its own expense.
The Moon is the private half, and it is usually the placement people recognise most sharply once it is described. It covers what you need in order to feel alright and what you do before you have thought about it. With the Moon in Aries you need to act on a feeling immediately, and to not be managed.
What settles you: movement, and being allowed to be annoyed without a conversation about it. And the giveaway, the thing people close to you would recognise: goes from fine to furious with nothing in between, and is over it an hour later. Aries is Fire and Cardinal, ruled by Mars.
Libra and Aries are opposite each other, which is a full moon birth, an opposition. Born at a full moon, with the Sun and Moon facing each other across the chart. What you want and what you need are opposites, and the usual report is a life spent working the tension out through other people.
Air and Fire are different elements, which is the part that actually produces the mismatch people notice: you are aiming with one kind of energy and recovering with another.
| Libra Sun | Aries Moon | |
|---|---|---|
| What it covers | What you are aiming at | What you need privately |
| Element and mode | Air, Cardinal | Fire, Cardinal |
| Ruled by | Venus | Mars |
| In one line | To be fair, and to make things work between people | To act on a feeling immediately, and to not be managed |
| Who sees it | You, and anybody who asks what you want | People who live with you |
Because the two disagree, you will recognise this: the thing you are working toward keeps costing you the thing you need. To be fair, and to make things work between people does not sit comfortably with needing to act on a feeling immediately, and to not be managed, and most people with this combination have arranged their life around the tension without ever naming it.
The useful move is not to pick a side. It is to notice which one you default to when you are tired, because that is almost always the Moon, and to notice what you have been postponing, because that is almost always the Sun.
There is a second thing these two placements tell you, and almost nobody mentions it. The distance from the Sun to the Moon, counted forwards, is the lunar phase you were born under. Aries is 6 signs ahead of Libra, which puts you in the full moon band.
That is a band rather than a verdict: the exact phase needs the degrees, not just the signs, so somebody at the edge of a sign could land either side of it. What a full moon birth is read as is here, along with the arithmetic to check your own properly.
Your rising sign, which is what people meet first and which needs a birth time. On any given day, twelve different people share this Sun and Moon and have twelve different rising signs, and they do not come across remotely alike.
If you do not know your birth time, this covers how to find it, including which record to ask your state for. And the Big Three together are covered here.
The Sun in Libra in full and the Moon in Aries in full. Sun opposition Moon covers the aspect itself, for anybody whose Sun and Moon are close enough in degree for it to count properly.
You aim to be fair, and to make things work between people while needing to act on a feeling immediately, and to not be managed. The two signs are opposite each other, so those pull against each other.
It is a demanding one, and that is not the same as bad. The friction is what forces people with this combination to examine themselves, which most comfortable combinations never have to.
Not for the Sun. For the Moon, often yes: the Moon changes sign every two and a half days, so anybody born on a day it moved needs a time to be sure.
Aries is 6 ahead of Libra, which puts you in the full moon band. The exact phase needs degrees rather than signs.
RubyAstro writes about astrology for reflection and self-understanding. Nothing here is medical, legal or financial advice, and none of it is a prediction of events. Read our full disclaimer.