Open Ephemeris
ChatGPT pluginAstrology, Human Design, BaZi
- Connection
- Remote
- Apps SDK app
- Yes
hosted by the developer
ships an in-chat UI
Movement
Over the last 30 days of daily snapshots.
Rank by placement
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.
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?”
- Categories
- Made by
- Open Ephemeris · Website
- Version
- 2.1.0
- Created At
- September 5, 2026
- More info