Planetary placements
See tropical Sun-through-Pluto positions, including Venus and Mars, for a broader view of your natal chart.
Free Astrology Tools
Explore birth charts, Big 3 signs, transits, compatibility, and more—all calculated privately in your browser.
- Exact tropical positions
- Honest unknown-time results
- Private browser calculation
Explore your chart
Popular Astrology Calculators
Birth ChartCalculate a complete natal wheel with Sun through Pluto, angles, whole-sign houses, aspects, degrees, and a table.Moon SignCalculate your Moon sign and see whether an unknown birth time crosses a sign boundary.Rising SignCalculate your Ascendant from an exact local birth time and birthplace.Venus SignCalculate your tropical Venus sign, degree, and motion locally in your browser.Zodiac CompatibilityCompare two zodiac signs with a fixed elemental and modality relationship model.Saturn ReturnFind exact Saturn longitude returns and preserve repeat hits caused by retrograde motion.Transit ChartCompare natal positions with a selected transit moment and calculate cross-chart aspects.Solar ReturnFind the exact annual return of the Sun to its natal longitude.
Beyond your Big 3
What can a full birth chart show?
Your Sun, Moon, and Rising are a starting point. A full natal chart brings the planets, houses, and their relationships into one view.
Explore your Birth ChartAscendant and houses
With an exact supported birth time, place your chart in whole-sign houses and find the Ascendant.
Major aspects
Explore conjunctions, sextiles, squares, trines, and oppositions between natal planets using the published orbs.
Accuracy before certainty
Why your birth time matters
The Rising sign changes as Earth turns, so it depends on the exact local time and birthplace. Without a supported time, ChartOdyssey leaves Rising unavailable instead of inventing an answer.
Understand birth-time accuracySun usually stays stable
The calculator checks the complete local day rather than relying on date ranges.
The Moon can cross a boundary
If two signs are possible that day, both remain visible in the result.
Rising needs the clock
Exact time and place are required to calculate the eastern horizon.
Private by construction
Your birth details stay in this browser
ChartOdyssey matches the city and timezone locally, then calculates tropical placements in your browser. Your birth date, time, city, timezone, latitude, and longitude are not sent to analytics or an external astrology calculation service.
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Astrology tools FAQ
Which astrology calculator should I start with?
Start with the Big 3 calculator above for your Sun, Moon, and Rising signs. Choose Birth Chart for Sun-through-Pluto placements, whole-sign houses, and major aspects. Use Transit Chart to compare a selected sky with your natal chart.
Are these astrology calculators free?
Yes. The calculators are free to use without an account. Birth details are processed locally in your browser rather than sent to an external calculation service.
Can I calculate a birth chart without a birth time?
You can explore supported planetary signs without an exact time. Rising and houses remain unavailable. When the Moon changes signs during your local birth day, the result shows the possible signs instead of choosing one.
What is the difference between compatibility and synastry?
Zodiac Compatibility compares sign elements and modalities. Synastry compares planetary aspects between two birth charts. Neither provides a scientific prediction of relationship success.
What can transits and return charts show?
Transit Chart compares planets at a selected UTC instant with your natal placements. Solar Return finds the Sun’s return to its natal longitude in a chosen year; Saturn Return searches for Saturn’s return crossings. These are astrology reference tools, not predictions of guaranteed events.