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Online Natal Chart Calculator

Built for astrology learners and chart structure review: enter birth datetime and coordinates to generate a natal wheel with tropical/sidereal switching and major body placement.

Enter birth date, time, and coordinates to generate a natal chart quickly.

Birth Date Birth Time

Latitude Longitude

Zodiac System House System

Natal Chart

Calculation Summary

Ascendant-

Midheaven (MC)-

Sun-

Moon-

Major Bodies

Note: This tool is for chart calculation and learning display only, not astrological advice.

Docs

Part 1: Tool Overview

Think of this tool as a “sky snapshot generator.” Enter your exact birth time and birthplace coordinates, and it calculates where major celestial bodies were at that moment, then renders a circular natal chart.
You also get a compact summary and a detailed major-bodies list for quick reading.

Part 2: Two Core Settings

1) Zodiac System: your celestial coordinate map

Tropical: anchored to the vernal equinox and seasonal cycle. This is the most common modern reference for Sun signs.
Sidereal: anchored to fixed stars. Common in Vedic contexts, and often around 24° behind tropical positions.

In short: Tropical follows seasonal reference points; Sidereal follows stellar background. This tool lets you compare both instantly.

2) House System: dividing life domains

The chart is a 360° circle. A house system divides it into 12 houses, each linked to a life area.

Placidus: most widely used, highly nuanced, but can behave unevenly at high latitudes.
Whole Sign: simplest mapping, one whole sign per house.
Equal House: starts from ASC and assigns exact 30° per house.

Beginner tip: start with Placidus or Whole Sign.

Part 3: Reading The Result

After clicking Generate Chart, focus first on the summary:

Sun: core identity, vitality, life direction.
Moon: emotional pattern, inner needs, instinctive response.
ASC: outward style, first impression, interaction mode.
MC: career vector, public role, social achievement axis.

Then review the major bodies:

Mercury: thinking and communication
Venus: values, affection, aesthetics
Mars: drive and action
Jupiter: growth and expansion
Saturn: structure, limits, long-term lessons
Uranus: disruption and innovation
Neptune: imagination, intuition, ambiguity
Pluto: deep transformation

Notations:

H10 means the body is in House 10
R means retrograde (geocentric apparent motion)

Part 4: Simple 3-Step Workflow

Enter accurate birth date, birth time, and coordinates.
Keep default Tropical + Placidus for the first run.
Generate and compare summary + chart + major-body list.

Important Notes

Natal charts are time-and-location specific snapshots.
Different zodiac/house settings can produce visibly different outputs.
This tool provides calculation and visualization only, not personal fate interpretation.

Last verified: 2026-04-15
Source: 0xStarcat/CircularNatalHoroscopeJS