Moon sign: what you feel before you can explain it
Your Sun sign answers 'who am I?'. Your Moon answers another question — 'what do I need to feel at home?'.
What the Moon sign is
Your Moon sign is the sign where the Moon stood at the instant of your birth. The Moon changes sign every two and a half days, so not everyone born in your month shares yours — which is why it tends to explain what the Sun sign can't reach: the moods, the caretaking habits, what soothes you and what unsettles you inside.
In an Astronna reading, the Moon anchors the chapter on your emotions, together with the 4th house — the house of roots. That's where readings tend to sound most intimate: 'it felt like someone read my diary' is almost always the Moon speaking.
Sun vs Moon: the difference that organizes everything
The Sun is what you are learning to be; the Moon is what you already know by heart. When the two sit in very different signs, a person feels a kind of permanent inner conversation — and seeing it named in the chart is often a relief.
To know your Moon for certain, all it takes is your birth date, time and place: in minutes your whole chart is computed with astronomical precision.