Real positions. Room for uncertainty.
Here is what comes from astronomy, what depends on your birth details, and what is an astrology interpretation.
The positions
We use ephemeris tables from NASA/JPL Horizons for asteroid 3 Juno and planet Venus. Juno here is the asteroid, not the NASA spacecraft with the same name.
The tables contain geocentric apparent ecliptic longitude of date. They account for light travel time, aberration and gravitational deflection. We request observer quantity 31 at Earth's center, with no atmospheric refraction. This is the tropical zodiac, divided into twelve 30-degree signs from the equinox. It is not a sidereal zodiac or a map of the astronomical constellations.
Our static data covers January 1, 1900 through December 31, 2099, with extra samples at both ends. We interpolate four adjacent daily observations using an angle-aware cubic polynomial. The derivative gives the apparent daily motion. We do not estimate Juno's sign from its average orbital period.
We display degrees to two decimal places for a known birth time and an approximate range for an unknown time. Displayed degrees are truncated within the sign so that rounding cannot turn 29.99° into a misleading 30° of that sign. A placement within 0.0001° of a sign boundary is treated as potentially belonging to either adjacent sign. Very slow motion is labeled “Near station” rather than assigned a confident direction.
Your birthplace and local time
The place search uses a local copy of GeoNames cities15000, containing more than 34,000 cities and their coordinates and IANA time zone identifiers. The data is available under CC BY 4.0. You can enter coordinates and a time zone manually if your birthplace is missing.
City matches use approximate city-center coordinates, not a specific hospital or street address. Location accuracy matters for houses. If your birthplace is far from the city center or your house is near a boundary, enter more precise coordinates when available. The 0.05° margin below covers our rising-point approximation, not an inaccurate place or birth record.
Your browser's time zone database converts the local birth time to universal time using the historical rules for that zone, including daylight saving changes. If the clock time occurred twice, you must select the first or second occurrence. If the time never occurred, we ask you to correct it or use unknown time.
Historical time zones are not perfectly documented everywhere. GeoNames assigns the current IANA zone to a place; old political boundary changes may require a different historical zone. For an unusual historical record, check the applicable zone and enter it manually. Use an up-to-date browser because its time zone rules affect the conversion. Before 1962, Horizons uses UT1 rather than modern UTC.
When the birth time is unknown
We check the entire local calendar day. That can be 23 or 25 hours during a daylight saving change, and some historical changes are larger. We include position and motion extrema within the interval, so a brief boundary crossing is not lost.
If Juno or Venus crosses a sign boundary, we show all possible signs and both interpretations. We omit houses. We never substitute a noon birth time and present it as certain.
For a known time, the entered minute represents a one-minute window, centered on that time. If even this short interval leaves more than one possible sign or house, we show the alternatives. If your birth time is only approximate, use the unknown-time mode.
The house system
This version uses whole-sign houses. The zodiac sign containing the ascendant is the first house, and each following sign is the next house. We calculate the eastern intersection of the horizon and ecliptic using your coordinates, sidereal time and obliquity of date.
Whole-sign houses are deliberately simpler to explain than unequal house systems such as Placidus. Their results can differ. We do not switch house systems silently. We check the entered minute and use a conservative 0.05° ascendant boundary margin to cover the approximation in sidereal time and obliquity.
We omit houses at latitudes of 66° or higher, where the rising point can behave unusually. Juno and Venus signs still work. A location without a reliable historical time zone can also limit the calculation.
The interpretation
The astronomical placement is a calculation. The relationship meaning is an editorial astrology interpretation. It is not a measured personality trait, a compatibility percentage or a scientifically validated prediction. We do not calculate a soulmate, a marriage date or a relationship outcome.
Our readings focus on commitment, mutual care and questions you can discuss. Juno and Venus offer different interpretive themes, so we show both without turning their relationship into a score.
Privacy and reproducibility
Every calculation loads the same static files and runs in your browser. Your date, time, place and result are not sent to a calculation API or placed in a URL. The source data snapshot and settings are available in our ephemeris manifest; place data attribution is available too.
Read our privacy statement for hosting request details, or calculate your Juno placement.