Understanding Your Western Natal Chart: Planets, Houses, and Aspects

What Is a Natal Chart?

A natal (birth) chart is a map of the sky at the exact moment and location of your birth, projected onto the ecliptic plane. In Western astrology, it uses the tropical zodiac — aligned with the seasons rather than the constellations — and divides the sky into 12 houses using a house system (most commonly Placidus).

The chart contains three fundamental layers: planets (what energy), signs (how it expresses), and houses (where in life it manifests). The geometric angles between planets — called aspects — add a fourth layer describing how these energies interact.

How AstroAsk Computes It

AstroAsk securely calculates precise tropical longitudes for 13 celestial bodies (Sun through Pluto, plus Chiron and the Lunar Nodes). Our proprietary methodology then instantly computes house cusps, determines sign placements, identifies dignities (domicile, exaltation, detriment, fall), and maps out all major and minor aspects with exact orb tolerances.

Reading the Output

• Planets Table: Each row shows a planet's sign, degree, element (Fire/Earth/Air/Water), modality (Cardinal/Fixed/Mutable), dignity status, and retrograde indicator.
• Houses Table: Lists each house's cusp sign, degree, ruling planet, and which planets occupy it. The 1st house (Ascendant) and 10th house (Midheaven) are the most prominent.
• Aspects Table: Shows every significant geometric relationship between two planets — the aspect type (conjunction, trine, square, etc.), whether it is harmonious or challenging, the orb (how exact it is), and its relative strength.
• Chart Wheel: The visual wheel places zodiac segments around the outer ring, house cusps as radial lines, planet glyphs at their ecliptic positions, and colored lines connecting aspecting planets.