The short answer
The honest short answer: your moon sign is the sign the Moon occupied when you were born, and traditions read it as your inner weather: feelings, instincts, what comfort means to you. Finding it takes a birth date and an ephemeris. What it cannot do is answer the live question underneath why you looked it up; that takes a conversation, not a table.
What moon signs can and cannot do
Within the traditions, the moon sign describes emotional temperament, what soothes you, and how you process feeling. Jyotish goes further and builds the whole chart from the rashi and nakshatra of the Moon.
It cannot tell you what someone else will do, settle a decision, or promise a date. And it changes nothing about your week unless you act. If the reason you are calculating it at midnight is a real question, the direct route is a reading with no birth details at all.
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