Open Ephemeris
ChatGPT pluginAstrology, Human Design, BaZi
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.
- Featured
- No
not on the featured shelf
Movement
From our daily snapshots over the last 30 days.
Rank by placement
Rank in Education & research
3 listing changes logged · latest Sep 22: Status, Availability, Sign-in. See what changed
In its category
How this plugin compares with others in the same category. Positions are counted within the category, not across the whole directory.
Education & research76th of 618 by placement
| # | Plugin | Position | 7d |
|---|---|---|---|
| 74 | #992 | 11places down | |
| 75 | #999 | 38places down | |
| 76 | #1003 | 156places up | |
| 77 | #1011 | 31places down | |
| 78 | #1029 | 38places down |
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
- Sign-in
- On Install
- Availability
- Available
- Version
- 2.1.0
- Created
- September 5, 2026
- More info
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