natal-chart-reading

Calculate planetary positions and astrological chart data using the NASA JPL DE440 ephemeris.

3|Updated Mar 19, 2026

Search Tags:#natal chart #horoscope #astrology #astronomy #ephemeris #planetary positions

Ready to run

npx skills add https://github.com/openephemeris/openephemeris-MCP --skill natal-chart-reading

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: natal-chart-reading
Source: https://github.com/openephemeris/openephemeris-MCP/tree/main/skills/natal-chart-reading
Command: npx skills add https://github.com/openephemeris/openephemeris-MCP --skill natal-chart-reading

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes assets (resource) components.

What problem does it solve?

This skill eliminates the complexity of manual astronomical calculations and the risk of hallucinated planetary positions by providing a direct, reliable interface to the NASA JPL DE440 ephemeris.

Core Features & Use Cases

Accurate Chart Generation: Computes natal, synastry, and transit charts with high precision for any date within a 1,100-year range.
Comprehensive Analysis: Provides detailed breakdowns of planetary placements, house systems, aspects, and dignities.
Use Case: A user provides their birth details, and the skill returns a structured, professional-grade astrological reading including the Big Three, nodes, and major aspects.

Quick Start

Use the natal-chart-reading skill to generate a full birth chart analysis for someone born on April 15, 1990 at 2:30 PM in Chicago.

Frequently Asked Questions about natal-chart-reading

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I calculate accurate planetary positions for a natal chart without hallucinating data?▼

To calculate accurate natal chart planetary positions without hallucinated data, this skill interfaces directly with the NASA JPL DE440 ephemeris. It computes precise astronomical placements for any date within a 1,100-year range, returning structured, LLM-ready astrological data.

What information is required to generate a full birth chart analysis?▼

Generating a full birth chart analysis requires valid birth date, time, and location inputs. The skill resolves geographic coordinates and historical timezone offsets from these inputs to return a professional-grade reading including the Big Three, nodes, and major aspects.

Can I calculate synastry and transit charts for compatibility and current planetary movements?▼

Yes, you can calculate synastry and transit charts for compatibility and current planetary movements. The skill supports natal, synastry, and transit analysis, providing detailed breakdowns of planetary placements, house systems, aspects, and dignities.

Does this natal chart tool provide house systems and planetary dignities?▼

Yes, this natal chart tool provides house systems and planetary dignities. It delivers comprehensive astrological analysis by calculating detailed breakdowns of planetary placements, aspects, and dignities using the NASA JPL DE440 ephemeris.

What is the most reliable ephemeris for generating expert-level astrological charts?▼

The most reliable ephemeris for generating expert-level astrological charts is the NASA JPL DE440 ephemeris. This skill eliminates manual astronomical calculation complexity by providing a direct interface to this data, ensuring high precision for any date within a 1,100-year range.

Are there limitations on the historical dates I can use for natal chart generation?▼

The limitation for natal chart generation is that dates must fall within a 1,100-year range. The skill calculates precise astronomical planetary positions and resolves historical timezone offsets for any valid date within this supported timeframe.