The astrology Big Three
Sun, Moon and rising sign calculator
The Sun, Moon and Ascendant summarize three different parts of a natal chart: solar identity, lunar habits and the sign rising at the local horizon.
Calculate your Sun, Moon and rising signs
Get the three most recognized tropical chart placements from one calculation.
Calculator input: Date determines the Sun, time refines the Moon, and exact time plus location determine the Ascendant.
Result preview: The result presents all three placements with degrees and houses where available.
This interactive calculator runs in the browser after the page loads. Inputs are calculated for the request and are not saved by the public preview.
Sun sign
The Sun sign comes from the Sun's tropical zodiac longitude at the birth moment. It changes approximately once per month.
Moon sign
The Moon sign changes every few days and can require an exact time when the Moon is near a sign boundary.
Rising sign
The rising sign is calculated from local horizon geometry and normally requires an accurate birth time and birthplace.
Frequently asked questions
Why are the Sun, Moon and rising signs called the Big Three?
They are commonly used as a compact introduction to identity, emotional patterns and outward presentation in modern Western astrology.
Which of the Big Three needs birth time?
The rising sign requires birth time and location. The Moon sign can also depend on time when the Moon changes signs that day.
Are the Big Three a complete chart?
No. A complete chart also includes the other planets, houses, aspects, angles and timing factors.