Who it is for
Astrologers and hobbyists who need particular house and zodiac settings rather than a generic reading.
True Sky
Chart calculations for natal, transit, and synastry work
Overview
What True Sky does
Mastering the Zodiac LLC provides astrological chart computation in ChatGPT. The calculations cover natal charts with planetary positions, house cusps, and aspects; transits timed against a birth chart; synastry between two charts; composite midpoint charts; and solar and lunar returns.
Configuration is exposed rather than fixed. Seven house systems are supported, among them Placidus, Whole Sign, Koch, and Equal, along with eleven zodiac systems including Tropical, Lahiri, and True Sidereal. Asteroids can be added as an option.
The listing states a free allowance of 100 calculations per day. A prompt supplies birth date, time, and place, as in the example asking for a weekly horoscope from a 1985 Dallas birth.
What stands out
House system, zodiac system, and asteroid options are all selectable, so a calculation can match a specific school of practice.
Availability
Where True Sky is listed
True Sky is listed in the ChatGPT apps directory only. Mastering the Zodiac LLC has no connector under the same domain in the Claude directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.
ChatGPT apps are built on MCP, and the same server can back a Claude connector, so the absence is a distribution decision rather than a technical one.
ChatGPT listing
In the ChatGPT apps directory
- Developer
- Mastering the Zodiac LLC
- Filed under
- Other
- Listed since
- June 2026
- Authentication
- Authenticates when installed
- Website
- masteringthezodiac.com
- Policies published
- Privacy policy · Terms of service
- Official listing
- Open in ChatGPT
- Snapshot
- August 2026
Example prompts from the listing
- What is my horoscope for this week? Born Mar 20 1985 at 10:15 am in Dallas
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This is an independent catalogue entry compiled by Node8 from True Sky's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with Mastering the Zodiac LLC, and inclusion here is not an endorsement.
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