Free tool
Birth chart calculator
Your complete natal chart — every planet by sign, degree and house, all major aspects, and a drawn wheel. Positions come from NASA JPL ephemeris data, with Placidus houses.
What a birth chart actually shows
A natal chart is a diagram of where the planets stood, from your vantage point on Earth, at the moment you were born. The zodiac ring records which constellation each body sat against. The twelve houses record which part of the sky it occupied relative to your horizon — and because the horizon turns a full circle every day, the houses depend entirely on your birth time and place.
Why your birth time matters so much
The Sun moves about one degree a day, so your Sun sign is safe even if you are hours out. The rising sign changes every two hours or so, and the Moon can move half a sign in a day. Without a recorded time we use noon, which keeps the planets right and leaves the houses approximate.
Placidus houses
Placidus divides the sky by time rather than by even angles, which is why house sizes vary in a real chart. Above the polar circles the method breaks down mathematically, and we fall back to whole sign houses.
And the other half of your chart
The same birth moment also produces a Saju reading — four pillars of heavenly stems and earthly branches, with its own account of your character. It is calculated at the same time here, free.See your Four Pillars.