What the chart records
The natal Moon's tropical zodiac degree is a fixed target. The opposite degree lies 180° around the zodiac. This calculator searches forward from your chosen UTC date for the next time the moving Moon reaches that degree, then recalculates the Sun, Moon, planets, Ascendant, and houses for that moment.
The Moon takes roughly 27–28 days to come back to the same zodiac longitude. It reaches the opposite longitude between those returns. This is not a full Moon unless the moving Sun happens to occupy the natal Moon degree. Nor is it the Sun–Moon phase-angle return, which matches the phase relationship recorded at birth.
The wheel marks the natal Moon axis as a dashed diameter; its ten planetary positions belong to the later return moment. The place determines the houses and angles. If you change only the return-chart coordinates, the exact UTC opposition stays the same, while those local features change.
Read the complete lunar opposition method and interpretation guide →