Natal Chart — real ephemeris, three house systems
Computes a birth chart from VSOP87 for the planets, ELP 2000-82B for the Moon and this site’s own solar-longitude solver for the Sun — checked against JPL Horizons to a few arcseconds — then divides it by Placidus, whole sign or equal houses and lists the aspects with their exact separations.
A birth chart computed from real ephemerides: VSOP87 for the planets, ELP 2000-82B for the Moon, and the solar-longitude solver this site already uses for the 절기 table. The tests check every body against JPL Horizons and hold it to five arcseconds. What the chart is then supposed to mean is a tradition the page names and attributes — it does not print a paragraph about your character, because the paragraphs in circulation are modern and copyrighted.
The positions on this page are real astronomy, right to a few arcseconds. That is a fact about the sky, not about you: astrology has no predictive basis, and nothing here knows anything about your life.
What the clock on the wall was, minus UT. Korea was +8:30 from 1954 to 1961 and +9 otherwise; half an hour is about seven degrees of Ascendant.
The angles
Ascendant ♍ Virgo 23° 59′ 10″
Midheaven ♊ Gemini 23° 14′ 31″
Positions
| Body | Sign | Longitude | House | Motion |
|---|---|---|---|---|
| ☉Sun | ♊ Gemini | 23° 47′ 28″ | 10 | 0.955°/d |
| ☽Moon | ♓ Pisces | 10° 38′ 54″ | 6 | 13.240°/d |
| ☿Mercury | ♊ Gemini | 5° 05′ 09″ | 9 | 1.700°/d |
| ♀Venus | ♉ Taurus | 18° 21′ 39″ | 8 | 1.176°/d |
| ♂Mars | ♈ Aries | 10° 47′ 12″ | 7 | 0.719°/d |
| ♃Jupiter | ♋ Cancer | 15° 48′ 46″ | 10 | 0.216°/d |
| ♄Saturn | ♑ Capricorn | 24° 03′ 09″ | 4 | -0.058°/d retrograde |
| ♅Uranus | ♑ Capricorn | 8° 10′ 44″ | 4 | -0.039°/d retrograde |
| ♆Neptune | ♑ Capricorn | 13° 43′ 34″ | 4 | -0.025°/d retrograde |
| ☊North Node (mean) | ♒ Aquarius | 9° 42′ 47″ | 5 | -0.053°/d retrograde |
Aspects
- ☽ Moon — ☿ MercurySquare84.44° · orb 5.56° · separating
- ☽ Moon — ♃ JupiterTrine125.16° · orb 5.16° · separating
- ☽ Moon — ♅ UranusSextile62.47° · orb 2.47° · separating
- ☽ Moon — ♆ NeptuneSextile56.92° · orb 3.08° · separating
- ☿ Mercury — ☊ North Node (mean)Trine115.37° · orb 4.63° · applying
- ♀ Venus — ♃ JupiterSextile57.45° · orb 2.55° · separating
- ♀ Venus — ♄ SaturnTrine114.31° · orb 5.69° · applying
- ♀ Venus — ♆ NeptuneTrine124.63° · orb 4.63° · separating
- ♂ Mars — ♃ JupiterSquare95.03° · orb 5.03° · applying
- ♂ Mars — ♅ UranusSquare92.61° · orb 2.61° · separating
- ♂ Mars — ♆ NeptuneSquare87.06° · orb 2.94° · applying
- ♂ Mars — ☊ North Node (mean)Sextile61.07° · orb 1.07° · separating
- ♃ Jupiter — ♅ UranusOpposition172.37° · orb 7.63° · separating
- ♃ Jupiter — ♆ NeptuneOpposition177.91° · orb 2.09° · separating
- ♅ Uranus — ♆ NeptuneConjunction5.55° · orb 5.55° · separating
How close counts as an aspect is a convention, not a fact — schools differ. The exact separation is printed so you can apply your own.
Houses and what they traditionally cover
| First | ♍ 23.99° | the body and the life; the person themselves |
| Second | ♎ 20.12° | property and movable goods |
| Third | ♏ 20.31° | brothers and sisters, short journeys, letters |
| Fourth | ♐ 23.24° | the father, the land, the end of the matter |
| Fifth | ♑ 26.32° | children, pleasure, games |
| Sixth | ♒ 26.98° | illness, servants, small animals |
| Seventh | ♓ 23.99° | marriage, partners, open enemies |
| Eighth | ♈ 20.12° | death, and the goods of the dead |
| Ninth | ♉ 20.31° | long journeys, religion, learning |
| Tenth | ♊ 23.24° | honour, office, the mother |
| Eleventh | ♋ 26.32° | friends and hopes |
| Twelfth | ♌ 26.98° | confinement, hidden enemies, large animals |
How exact this is, and where it stops
Positions are from VSOP87D for the planets, ELP 2000-82B for the Moon, and this site’s own solar-longitude solver for the Sun — the same one behind the 절기 table. The tests check every body against JPL Horizons and hold them to five arcseconds over 1900–2024; beyond about 2035 the limit is ΔT, which is a prediction. Pluto is not included: every body here comes from a published analytical series, and there is no compact public one for Pluto, so it would be the only guess on the page.
Sources
- Planets: VSOP87D (Bretagnon & Francou), truncated at 2 × 10⁻⁶, from CDS catalogue VI/81.
- Moon: ELP 2000-82B main problem (Chapront-Touzé & Chapront), truncated at 0.1″, from CDS catalogue VI/79.
- Sun, nutation and obliquity: this repository’s korea/solar-terms module, checked against the 절기 instants published by 한국천문연구원.
- Verification: JPL Horizons apparent ecliptic-of-date longitudes, pinned as fixtures in the tests.
- House topics: Ptolemy, Tetrabiblos (Ashmand 1822) and Lilly, Christian Astrology (1647). Public domain.
- House topics as they are given in the classical sources — Ptolemy’s Tetrabiblos (2nd century, Ashmand’s 1822 translation) and Lilly’s Christian Astrology (1647), both public domain. Rulerships are the traditional assignments, with the modern outer-planet rulers noted separately.
How to use it
Get the time and the offset right
The Ascendant moves a degree every four minutes, so the birth time matters more than anything else on the form. The offset is what the wall clock read minus UT — and it has moved: Korea ran on UTC+8:30 from 1954 to 1961. Half an hour is seven degrees of Ascendant.
Choose a house system knowing what it does
Whole sign gives house 1 the entire sign the Ascendant is in — the oldest arrangement and the simplest. Equal cuts every 30° from the Ascendant itself. Placidus divides each point’s semi-arc, which is why it needs a latitude and why it has no answer above the polar circle; there the tool says so and falls back rather than inventing cusps.
Watch for the boundary warning
If a body is within half a degree of a sign boundary the page says so. That is where the arcsecond accuracy of the positions stops helping: your birth time is probably not known to two minutes, and two minutes is half a degree of Ascendant.
Common questions
Where is Pluto?
Not here. Every body on the page comes from a published analytical theory in machine-readable form — VSOP87 for the planets, ELP for the Moon — and there is no compact public series for Pluto: JPL dropped it from its approximate-elements table, and the usual 43-term series is a book table. A Kepler propagation would be about a degree out within a century, which can put it in the wrong sign. One guess among nine computed positions is worse than an absence that says why.
How do I know the positions are right?
They are checked against somebody else’s ephemeris. The test file pins apparent ecliptic longitudes from JPL Horizons for nine bodies at five epochs from 1900 to 2100 and requires agreement within five arcseconds up to 2024. That check has already earned its place: the first version left out annual aberration and every planet was exactly 20.5 arcseconds out, which nothing else would have caught.
Why are there no readings for my placements?
Because we would have to make them up or copy them. The familiar "Mars in Scorpio means…" paragraphs are 20th-century and under copyright; the classical sources say something far more specific and would need quoting at length to be quoted fairly. What the page gives instead is the structure of the tradition — rulerships, elements, and what each house has covered since Ptolemy — which is factual and is a better starting point than a borrowed paragraph.
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