# GEOMETRY -- Deterministic Date JSON for RAG & AI Builders (geometry.app)

Serves the same structured JSON for any date from 1900 to 2100, covering calendars, moon phases, seasons and planetary retrogrades.

- Atlas card: https://inite.ai/en/atlas/geometry.app
- Site: https://geometry.app
- For: RAG and AI builders who need fixed calendar, moon, season and planet facts for their assistants
- Use 0/100 · alive 100/100

## Used for

- answer moon phase and season questions from fixed JSON
- check leap years and weekdays for a given date
- ground an AI assistant's date answers in structured data

## Price

- from 28 USD/month, free plan (read 2026-10-14 on https://geometry.app/pricing/)

## For developers

- MCP server: app.geometry/mcp (namespace; open on 2026-10-14, 8 tools)
- Read 2026-10-14

## Your data

- Certifications stated: gdpr
- Read 2026-10-14

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Source: INITE Atlas, https://inite.ai/en/atlas/geometry.app. JSON: https://inite.ai/api/atlas/geometry.app. MCP: https://inite.ai/api/mcp (atlas_lookup).