Free Calculator
Sun, Moon & Rising Calculator
your Big 3 — the three placements that run your life. start with your birthday.
Step 2: Your Full Big 3
your Sun sign is just the start. add your email to decode Moon + Rising — free.
what is a Big 3 in astrology?
your Big 3 refers to three placements in your birth chart: your Sun sign (identity), your Moon sign (emotions), and your Rising sign (how people see you). together, they form the core architecture of your chart.
reading only your Sun sign is like reading the title of a book. your Big 3 gives you the title, the first chapter, and the genre.
full Big 3 guide →explore every sign
frequently asked
How do I calculate my Big 3?
Enter your birthday for your Sun sign. For Moon and Rising, you also need birth time and birth location. Our free decoder handles all calculations.
Can I find my Big 3 without birth time?
Sun sign only needs your birthday. Moon sign requires birth time (changes every 2.5 days). Rising sign requires exact birth time (changes every 2 hours).
What's the difference between Big 3 and birth chart?
Big 3 covers three placements (Sun, Moon, Rising). A full birth chart covers all 10 planets across 12 houses, plus aspects. Big 3 is the starting point; birth chart is the complete picture.