Natal chart
The natal chart (or birth chart) is the map of the sky at the exact moment of birth, with the position of the planets, the zodiac signs they were in, the astrological houses and the angular aspects between planets. It is the founding document of any personal astrological reading.
Origin and etymology
The practice of casting individual natal charts dates back at least to the 5th century BC in Babylon, where astrologers calculated planetary positions for kings and aristocrats. Its technical systematisation occurred in the Hellenistic period (2nd century BC – 2nd century AD), with authors like Dorotheus of Sidon, Vettius Valens and, above all, Claudius Ptolemy in his Tetrabiblos. The natal chart in its current form is a direct heir of that system.
In the Renaissance, astrologers like Marsilio Ficino and Girolamo Cardano elevated natal chart casting to a sophisticated art. Today, thanks to computer calculation, the natal chart — which used to require hours of manual astronomical calculation — is obtained in seconds. What remains an art is its interpretation: integrating 10 planets in 12 signs × 12 houses with their aspects requires subtle synthesis.
The layers of the chart
A complete natal chart contains: 10 planets (Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto) in their respective zodiac signs, distributed in 12 astrological houses that represent areas of life (House I = image, House VII = partnership, House X = profession, etc.). The aspects — angles between planets — describe the inner dynamics: conjunction (0°), opposition (180°), square (90°), trine (120°), sextile (60°).
The ascendant and the midheaven are the two most relevant cardinal points after the Sun and Moon. Together, these elements form an extraordinarily detailed portrait of the psyche, vital tendencies, karmic learnings and areas where the person shines or struggles. The chart is not fixed destiny: it is a map of tendencies that free will can navigate in many ways.
How it is read
A good reading begins with the essential triad: Sun, Moon, ascendant. That gives 80% of the portrait. Then look at Venus and Mars (how you love, how you desire). Then the outer planets and aspects. For prediction, techniques are used over the natal chart: transits (current planets passing over your chart), progressions, solar returns. The natal chart is the ground; predictive techniques read the weather over that ground at different moments.
Also known as
- Birth chart
- Natal map
- Geniture
- Natal horoscope