Western Natal Chart · Sun · Moon · Ascendant.
Your full Western natal chart — the 10 traditional planetary bodies, Chiron, the Nodes, and the 12 Placidus houses. Same physics the professional reader works from; same apparent-geocentric ephemeris.
Your natal chart appears here.
Enter your birth date, time, and city, then compute. Sun, Moon, Ascendant, 10 planets + Chiron + Nodes, 12 Placidus houses will appear in this panel.
How we compute this
◆ The methodConvert to Julian Day
Your local birth date + time + timezone becomes an exact UTC instant, then a Julian Day — the continuous timescale every ephemeris expects. Without timezone the Sun sign is still right but the Ascendant drifts.
local → UTC → Julian Day (JD) for ephemeris lookupGeocentric planetary positions
Apparent geocentric ecliptic longitudes for the 10 traditional bodies (Sun, Moon, Mercury → Pluto) from astronomy-engine — MIT-licensed, NASA-JPL-grade. Chiron, Ceres, Pallas, Juno, Vesta, Black Moon Lilith come from published ephemeris tables.
10 planets + asteroids + mean Nodes at JDAscendant + Placidus houses
Ascendant and Midheaven are derived from your birth latitude and longitude — a 100-mile shift rotates the Ascendant by ~1 minute of arc. Placidus divides diurnal arcs into 12 house cusps, the standard modern Western layout.
lat · lng → ASC · MC · 12 Placidus cuspsThis same date, in other systems
◆ Cross-referenceTerms used on this page
Frequently asked questions
What does the Western natal chart calculator compute?
The calculator computes a full tropical-zodiac, Placidus-house Western natal chart from your birth date, time, and city. It returns the Sun, Moon, and Ascendant; all 10 traditional planetary bodies (Mercury through Pluto); Chiron; the lunar Nodes (North and South); the Midheaven angle; and the 12 Placidus house cusps. Each point is given as a sign + degree + minute reading. The same apparent-geocentric ephemeris a professional Western reader uses — astronomy-engine, accurate to better than one arcminute for the modern era.
Do I need exact birth time for a Western natal chart?
For Sun, Moon, and the planets — no, the date alone gives accurate signs to within a degree per day. For the Ascendant, Midheaven, and the 12 Placidus houses — yes, ideally within four minutes. The Ascendant moves through one full zodiac sign every two hours, so a one-hour error can shift it by half a sign. If you do not know your birth time, the calculator still produces the planetary chart, but the houses and angles should be treated as illustrative.
What house system does this calculator use?
Placidus, the most widely-used Western house system since the 17th century. Placidus divides each quadrant of the natal sky by time rather than by space, producing unequal house sizes that compress near the equator and expand at high latitudes. K A X A N T A returns Placidus by default because it is what nearly all Western astrology textbooks, software, and practitioners assume. Other systems (Whole Sign, Equal, Koch, Porphyry) are not currently exposed in the public calculator.
This is one of nine systems.
Your Western chart gives you the geometry. Your Human Design translates the geometry into decisions. Your Ba Zi tells you which years are built for which moves. Get the synthesis — your full blueprint, free.