Deterministic chart tool
Ascendant calculator
Find the rising sidereal sign for a recorded birth time, birthplace, and timezone.
Your result
Enter your details to see the result and the exact method used.
Approximate Lahiri-style sidereal offset; boundary labels may differ from a reference ephemeris. Do not use this result for consequential decisions.
What this tool calculates
The ascendant is calculated from the birth instant, geographic coordinates, local sidereal time, and the beta’s approximate sidereal offset. Its sign is house one under the whole-sign method. It can change quickly, so a guessed or rounded birth time can make this result unreliable.
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 →