Enter your birth date, local time, and birthplace to create a free natal chart. Check the Sun, Moon, Rising sign, planetary positions, houses, and major aspects before choosing any AI interpretation.
Planets & Signs · Temperament, archetypes & timing
Enter your birth date, recorded local time, and birthplace to create a natal chart without signing up. The result shows the Sun, Moon, Rising sign when time is reliable, planetary positions, houses, and major aspects. OpenFate calculates the chart first and keeps optional AI interpretation as a separate step.
A birth chart calculator starts with a local birth date, time, and place. It converts those inputs into planetary longitudes, angles, houses, and aspects. The result is easier to verify when the time-zone conversion, birth-time reliability, zodiac, and house system are visible.
OpenFate stores the rule-based chart before adding any AI explanation. Matching birth data should be compared under the same calculation settings, especially when a placement lies near a sign or house boundary.
Use the date and local clock time from the birth record. Add the birth city or coordinates. The location supplies latitude and longitude. The date and place establish the historical time zone and daylight-saving rules.
The chart displays the Sun, Moon, planets, zodiac positions, and major aspects. When the birth time supports them, it also shows the Ascendant, Midheaven, 12 houses, and house cusps. These calculated fields are the evidence layer for any later reading.
The Ascendant and houses move quickly and depend on time and location. When the birth time is unknown or approximate, retain that uncertainty rather than presenting time-dependent placements as established facts.
OpenFate uses tropical Swiss Ephemeris calculations, with Placidus as the default and six other house systems in Chart settings. Other calculators may use sidereal positions or another house system. They may also use different node and rounding rules. Compare the settings before judging a difference.
The calculation engine creates the chart from birth inputs and declared settings. AI can organize those existing placements into readable explanations. It does not supply missing birth facts or make the symbolic interpretation scientifically predictive.
Follow the editorial standards, shared validation process and the exact method used for this system.
A different house placement is not automatically a calculation error. Follow the inputs, method, checks and reading in order.
Align the local date, birthplace, historical time zone and UTC instant. If the birth time is unknown, do not treat a reference-time chart as a verified Ascendant or house layout.
Seven house systems can change cusps and house placements, not the planets’ geocentric longitudes at the same instant. Node choice and aspect orbs are separate settings. The calculator can compare two house systems side by side.
The public records separate an independent planetary-longitude comparison from extended checks in the Swiss Ephemeris family. Neither certifies every calculation or an AI interpretation.
Inspect the generated natal examples and their recorded questions. Advanced calculator results can be exported, but they are temporary and do not enter a saved report or its follow-up context.
Swiss Ephemeris calculates the tropical natal chart. Placidus houses and mean nodes are defaults; Chart settings offers seven house systems, true nodes, aspect ranges and four optional asteroids. AI explains those chart facts. Annual profections, sampled slow-planet transits and optional relocation add context without changing the natal chart.
A dated check compares 240 planetary longitudes across 24 synthetic inputs with Astronomy Engine, separately from 8 input-rejection checks.
Start with your natal chart. Explore its themes in a reading, then use in-depth follow-up for the details that matter to you.
Find your Sun, Moon, Rising sign, planets, houses and major aspects in the free chart.
An AI reading brings the placements together across everyday patterns, relationships and work, with annual context.
Use in-depth follow-up to ask which placements support a point, what complicates it, and how it relates to your question.
The complete reading is organized into up to 11 distinct layers instead of repeating a list of placements.
Annual context and house-dependent sections appear only when the birth time and calculated evidence support them. Missing data is stated rather than guessed.
Inside a reading · editorial example
Read together, a Capricorn Sun and Scorpio Moon can suggest a wish to build something dependable while keeping deeper feelings private. Their sextile offers a connection to explore: structure may help give those feelings an outlet, rather than simply contain them. A useful reflection is whether planning helps you express what matters—or postpones the conversation.
A short interpretation of two placements from a synthetic chart—not a full AI report or a customer’s story.
For readers who need the underlying data, this free workspace supports 7 house systems, mean or true lunar nodes, adjustable aspect orbs and 16 bodies. Nothing is calculated until you open the tool and submit it.
Free calculation. Results are not saved or added to an existing report. Reloading clears this workspace.
The chart calculation is not made more accurate by paying. Payment unlocks a deeper synthesis, a saved reading and continued questions.
You pay for deeper synthesis and follow-up—not for more accurate astronomical positions.
Answers about free chart creation, required birth data, Rising signs, unknown birth times, settings, calculator differences, and AI interpretation.
Yes. You can create and inspect the basic natal chart without signing up. AI interpretation and in-depth follow-up are a separate later step.
Use the birth date, recorded local clock time, and birthplace. The place identifies latitude, longitude, time zone, and historical daylight-saving context needed for angles and houses.
You can still inspect some planetary signs, but the Ascendant, Midheaven, and houses cannot be confirmed reliably. Do not enter noon or midnight just to produce a complete-looking chart; preserve the uncertainty.
No. The Sun and Moon signs come from those bodies' zodiac positions. The Rising sign is the sign on the eastern horizon and changes with birth time and place, which is why accurate local time matters.
First check the recorded time, coordinates, time zone, and daylight-saving conversion. Then compare the tropical or sidereal zodiac, house system, node setting, ephemeris, and rounding rules. Align the inputs and settings before comparing results.
The Western astrology engine uses tropical Swiss Ephemeris calculations with Placidus as the default. Chart settings offers seven house systems, mean or true nodes, aspect ranges and optional asteroids. The chart also records birth-time precision so time-dependent fields can be treated with the appropriate confidence.
No. The chart engine calculates the placements, angles, houses, and aspects first. AI can explain that stored output later, but it should not invent a birth time or freely rewrite the calculated chart.
Yes. Open Chart settings before creating a chart to choose one of seven house systems, mean or true nodes, an aspect range and optional Ceres, Pallas, Juno and Vesta. The new chart and report use the same saved settings, and follow-up refers to that saved chart. Existing reports stay unchanged. Western astrology settings, explained
A repeated hour requires the daylight-time or standard-time occurrence to be resolved. A nonexistent local time is rejected for correction rather than silently shifted. Use the actual birth record; changing the clock time can change angles and houses. Western astrology settings, explained
Placidus and Koch support ±65° in this product. For higher latitudes, explicitly select a supported alternative such as Whole Sign or Equal House, up to ±89°. OpenFate never silently changes your chosen method; unavailable geometry is reported as an error. Western astrology settings, explained
Yes. Open the advanced calculator, choose local time and city, select Natal chart, then choose a second house system. Compare any two of the seven supported systems using one resolved birth instant and location. The result shows which selected bodies change house and the 12 cusp longitudes side by side; zodiac positions remain the same. Unavailable methods are reported, not silently replaced. JSON includes both results; CSV contains the first result only. This is a temporary calculation, not a saved report or an in-depth follow-up conversation, and it does not establish which house system is more accurate. Western astrology settings, explained
