{"uid":"cap_s_wuWMg38QWuhkV5RTP2F","slug":"561-group-astronomy-positions-api-7a4cc937","name":"561 Group Astronomy Positions API","description":"Apparent geocentric ecliptic longitude, latitude and angular speed with lunar illumination, computation provenance and measured error bounds.","url":"https://market.561.group/v1/astronomy/positions/:date?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.04","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.04/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_q6klxEDyqg5vB_Pc5Nu9W","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.04","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"What is the apparent geocentric ecliptic longitude, latitude, and angular speed of the Moon on March 15, 2025, including its lunar illumination percentage and the error bounds on that computation?","exampleUseCases":[{"title":"Astrology chart body positions","prompt":"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?"},{"title":"Lunar phase tracking for ritual calendar","prompt":"What is the Moon's ecliptic longitude and illumination for tonight, November 12, 2025? I need the angular speed and computation provenance too."},{"title":"Historical planetary position research","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-04T12:34:19.659Z","isFirstParty":false,"canonicalSlug":"561-group-astronomy-positions-api-7a4cc937"}