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Deterministic chart tool

Moon sign calculator

Find the Moon’s sidereal sign from an exact birth time and place, with its degree and nakshatra.

Enter birth details

Use a recorded exact time. A guessed time can change the rising sign and other time-sensitive results.

Calculated in this browser. Birth details are not sent to or stored by our server.

Your result

Enter your details to see the result and the exact method used.

What this tool calculates

The script calculates the apparent geocentric Moon longitude for the birth instant, subtracts the beta’s approximate Lahiri-style offset, and assigns one of twelve 30° sidereal signs. It also shows the Moon’s nakshatra and pada. This is a coordinate calculation, not a horoscope or personality reading.

It uses the same Astronomy Engine calculation and conventions as the D1 chart. For the full placement table, chart, birth instant, coordinates, and method details, create a chart.

Understand the sidereal method →