# Open Ephemeris (ChatGPT App)

> Astrology, Human Design, BaZi

- Type: app
- Publisher: Open Ephemeris (official)
- Categories: Education, Design, Lifestyle
- Website: https://chatgpt.com/plugins/plugin_asdk_app_6a9c2787bc48819197698e71b29ef7c2
- Open in ChatGPT: https://chatgpt.com/plugins/plugin_asdk_app_6a9c2787bc48819197698e71b29ef7c2
- Version: 2.1.0
- Listed: 2026-10-04

## About

Open Ephemeris gives ChatGPT real astronomy to work from. Every position comes from the NASA JPL DE440 ephemeris covering 1550-2650 CE at sub-arcsecond precision, the same kernel used for spacecraft navigation, so positions are computed rather than estimated.

Ask for a natal chart and an interactive wheel opens in the conversation. Click a planet, a house, or an aspect line and the interpretation loads in place. Switch house systems without asking again. The same applies to Human Design bodygraphs, synastry bi-wheels, transit timelines, Vedic Rashi grids and BaZi Four Pillars charts.

Beyond charts: transits and progressions, solar and lunar returns, eclipse timing and local visibility, astrocartography, electional search for timing windows, and fixed-star positions.

Free to start, no card required.

## How to use

1. **Add it in ChatGPT** Open Open Ephemeris in ChatGPT's Plugin directory (button above), select + to add it and sign in if asked.

2. **Use it in a chat** Type @ in the composer and pick Open Ephemeris, or start your message with its name. ChatGPT may also suggest it when it fits what you ask.

## Example prompts

- "Make me an interactive natal chart for July 20, 1969 at 8:17 PM in Houston, Texas."
- "Show me the Human Design bodygraph for someone born January 15, 1990 at 10:00 AM in London."
- "What's the moon phase right now, and when is the next full moon?"

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Source: https://chatgptplugins.directory/apps/open-ephemeris · Index: https://chatgptplugins.directory/llms.txt · Independent and community-run. Not affiliated with or endorsed by OpenAI. ChatGPT is a trademark of OpenAI.