561 Group Astronomy Positions API

x402

561 Group Astronomy Positions API is a paid API for AI agents from market.561.group, paid per call via x402, $0.04/call, status unknown (last checked 2026-11-04).

Returns apparent geocentric ecliptic longitude, latitude, and angular speed for a celestial body on a given date, including lunar illumination, computation provenance, and error bounds.

Price / call$0.04

Seller volume →—

Success—

StatusUnknown

How this service works

Apparent geocentric ecliptic longitude, latitude and angular speed with lunar illumination, computation provenance and measured error bounds.

Output

Returns apparent geocentric ecliptic longitude (degrees), latitude (degrees), and angular speed (degrees/day) for the requested body and date, plus lunar illumination percentage, a computation provenance record identifying the underlying ephemeris, and measured error bounds indicating the precision of the result.

Example use cases

Astrology chart body positions

“I'm generating a natal chart — can you pull the apparent geocentric ecliptic longitude and latitude of the Sun, Moon, and Venus for July 4, 1990, along with the lunar illumination and any error bounds?”

Lunar phase tracking for ritual calendar

“What is the Moon's ecliptic longitude and illumination for tonight, November 12, 2025? I need the angular speed and computation provenance too.”

Historical planetary position research

“I'm researching a historical conjunction — give me the apparent geocentric ecliptic coordinates and angular speed of Jupiter on October 28, 1628, with error bounds so I can assess accuracy.”

Technical details

Endpoint

GEThttps://market.561.group/v1/astronomy/positions/:date?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need geocentric ecliptic coordinates (longitude, latitude, angular speed) for a specific date with explicit error bounds and provenance metadata, particularly for astrological or astronomical applications that require transparency about computational accuracy. Prefer this over generic astronomy APIs when you also need lunar illumination and a clear audit trail of how the position was derived.

Side effects

Invalid or unparseable date format — returns an error indicating the date parameter is malformed
Date out of supported ephemeris range — returns an error if the date falls outside computable bounds
Missing required date path parameter — returns a 400-style error
Payment not completed via x402 — returns HTTP 402 requiring USDC payment before data is served

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