What developers build with the Transit API
The Human Design Transit API lets you integrate real-time planetary transit data into any application. Transits represent the current positions of celestial bodies mapped to the 64 Gates of the Human Design bodygraph. They show the collective energetic weather that affects everyone, and when overlaid on a personal chart, reveal individual timing insights.
Three endpoints power different transit use cases:
POST /v1/transit(Basic plan, 0.5 credits) — Returns the current transit chart: planetary positions mapped to Gates and Lines, with defined Centers. This is what you need for a “daily energy forecast” widget or transit calendar.POST /v1/transit-overlay(Standard plan, 1.5 credits) — Combines a natal chart with transit positions to create a personal overlay. Returns natal and transit Gates, electromagnetic connections, channel completions, and overlay Center definitions. This is the foundation for personalized transit notifications.POST /v1/transit-window(Enterprise plan, 5.0 credits) — Calculates transit charts across a rolling time window (multiple days). Returns snapshots showing how Gate activations change over the period. Essential for transit calendars and forecasting features.
Example: Fetching today’s transit
curl -X POST https://api.humandesignhub.app/v1/transit \
-H "X-API-KEY: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"datetime": "2026-03-20T12:00:00+09:00"}'Response includes the transit chart with activated Gates, defined Centers, and planetary positions mapped to the bodygraph.
Use case scenarios
Daily digest apps — Fetch the transit once per day and generate a summary of activated Gates. Combine with user charts via the overlay endpoint for personalized daily readings.
Notification systems — Use the transit-window endpoint to look ahead and trigger push notifications when significant transits (like channel completions) are approaching for a user.
Transit calendars — Build visual calendars showing Gate activations over weeks or months. Color-code by circuit (Individual, Tribal, Collective) for pattern recognition.
Timing tools for coaches — Help Human Design practitioners identify optimal timing for their clients by overlaying personal charts with upcoming transits.
Why use an API instead of calculating yourself
Transit calculation requires high-precision planetary position math plus the full Human Design mapping layer (planet to Gate to Line to Center). The API handles all of this in a single request. Building this from scratch would require a reliable astronomy stack, degree-to-Gate conversion tables, and ongoing maintenance of the underlying calculation data.