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Deterministic chart tool

Sidereal Sun sign calculator

Find the Sun’s sidereal sign and exact degree; see why it may differ from a Western tropical sign.

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 Sun longitude, applies the same approximate sidereal offset as the chart, and assigns a 30° sign. This tool explicitly reports a sidereal Sun sign, not a tropical Western Sun sign.

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 →