A focused set of free astrology calculators and chart tools for birth charts, current planets, timing cycles, relationship charts, and place-based exploration. Powered by Swiss Ephemeris astronomy.
Core chart placements
The placements most readings start from: Sun, Moon, rising sign, and the full natal chart context around them.
- Free Birth Chart Calculator — Free birth chart calculator. Enter your birth date, time, and city to see your natal planetary placements — Swiss Ephemeris accuracy, no sign-up.
- Big Three Calculator — Find your Big Three free — your Sun, Moon, and rising signs in one place. Enter your birth date, time, and city for your core astrological trio.
- Moon Sign Calculator — Find your Moon sign free. Enter your birth date to discover the sign your Moon was in — the seat of your emotional instincts and inner world.
- Rising Sign — Find your rising sign (ascendant) free. Enter your birth date, exact time, and city to discover the sign rising on your eastern horizon at birth.
Charts and sky data
Planetary positions, moon phases, ephemeris tables, and source-quality checks powered by Swiss Ephemeris.
- Current Planets — See where the planets are right now by sign and degree. A free, live snapshot of the current sky on real Swiss Ephemeris astronomy, no sign-up.
- Ephemeris Calculator — Generate a free ephemeris table of planet positions across any date range, with sign, degree, and retrograde for each day. Swiss Ephemeris accuracy, no sign-up.
- Moon Phase Calculator — Find the Moon phase for any date, from new and full to quarter, crescent, and gibbous, with illumination percent and the Moon sign. Free, accurate astronomy.
- Rodden Rating — Find out how reliable your birth time is with the Rodden Rating system. See whether your Ascendant, houses, and Moon can be trusted, free and with no sign-up.
Timing and cycles
Explore transits, returns, and day-by-day sky patterns as timing language rather than fixed outcomes.
- Energy Timeline — View a month-by-month curve of how active your transits are, with the themes behind each peak.
- Electional Astrology — See a free day-by-day view of the sky ahead: Moon phase, Moon sign, and the balance of supportive versus challenging aspects, as a timing reference for your own planning. Not a prediction.
- Solar Return Calculator — Free solar return calculator. Find the exact moment the Sun returns to its birth position each year and see your birthday chart. Real astronomy, no sign-up.
- Saturn Return Calculator — Find when Saturn returns to its birth position — the timing of a major life-cycle chapter.
Relationship charts
Compare two charts and examine attraction, friction, support, and the shared pattern between them.
- Synastry Calculator — Free synastry calculator. Compare two birth charts to see the aspects between them, from Sun and Moon to Venus and Mars. Real astronomy, no sign-up.
- Composite Chart Calculator — Free composite chart calculator. Merge two birth charts into one midpoint chart that represents the relationship itself. Real astronomy, no sign-up.
Place and discovery
Use maps and reference datasets to place chart symbolism in a wider world context.
- Astrocartography Map — Free astrocartography map. See where each planet was rising, setting, culminating or at the lower meridian when you were born, drawn across a world map. Real Swiss Ephemeris astronomy, no sign-up.
- Celebrity Astro Twins — Find out which famous figures share your Sun sign. Enter your birth month and day to see your celebrity astro twins, grouped by zodiac sign and element. Free, no sign-up.