# Swiss Ephemeris

> Use this tool when you need to calculate precise planetary positions and chart angles for astrology applications or celestial mechanics. It solves problems requiring high-precision ephemeris data, such as generating birth charts or predicting celestial events. It takes date, time, and location as inputs and returns geocentric tropical zodiac coordinates with declination, speed, and retrograde motion indicators.

Canonical page: https://skillsregistry.net/skills/gh-scottchronicity-ephemeris  
JSON: https://api.skillsregistry.net/v1/skills/gh-scottchronicity-ephemeris

## Description

Provides precision astronomical calculations for planetary positions, house cusps, and chart angles using the Swiss Ephemeris library. Returns geocentric tropical zodiac coordinates with declination, speed, and retrograde motion indicators. Designed for astrology applications and celestial mechanics requiring high-precision ephemeris data.

## Trust

- **Trust score (0–1):** 1.00
- **Verification tier:** verified
- **Last scanned:** 2026-09-28

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-09-28

## Source

- **Source listing:** [PulseMCP](https://www.pulsemcp.com/servers/gh-scottchronicity-ephemeris)
- **Repository:** <https://github.com/scottchronicity/ephemeris-mcp>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "gh-scottchronicity-ephemeris"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/gh-scottchronicity-ephemeris` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/gh-scottchronicity-ephemeris/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt