Sun Sign and Rising Sign Calculator — Ascendant Not Calculated
Find the Sun sign for a birth date. This page does not calculate a rising sign because it does not collect birthplace, longitude or time zone.
Last updated · View algorithm, constants and default inputs (JSON)
Find the Sun sign for a birth date. This page does not calculate a rising sign because it does not collect birthplace, longitude or time zone.
About this calculator
Find the Sun sign for a birth date. This page does not calculate a rising sign because it does not collect birthplace, longitude or time zone.
Worked example
calculated with the default values below
Date of birth 1990-06-15 Sun sign (date only) Gemini · Rising sign (not calculated) Not calculated · Why it is unavailable An accurate ascendant requires a complete birth date, exact local time, longitude and time zone. This page does not calculate an actual rising sign.
General background references
Disclaimer
These calculators give general estimates. Sizing, pricing, availability and standards vary by brand, retailer and country, so treat the output as a starting point and confirm it against the seller's or authority's own figures.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
H = (T - 6 - D + 24) mod 24; A = floor((2H) mod 12); g = round((15H) mod 30)
- T
- Birth time (24 h)
- D
- 1 with daylight saving, else 0
- H
- Hours after assumed 06:00 sunrise
- A
- Ascendant index 0–11, sign lookup
Sun sign uses calendar-date cutoffs. No ascendant is calculated because required birthplace, longitude and time-zone inputs are absent.
Frequently asked questions
Why is no rising sign shown?
An accurate ascendant calculation needs a complete birth date, exact local birth time, longitude and time zone. This tool does not collect enough location and time-zone information, so it shows the Sun sign only and does not guess an ascendant.