{
  "name": "Zodiacs sky-fact benchmark",
  "version": "v0",
  "tool": "check_sky_fact",
  "note": "Each reply is what check_sky_fact returns for the request beside it, unchanged: the MCP adapter's structured content, which is the compute API's sky-fact body for the same request apart from cite.url.",
  "checks": {
    "facts": 2022,
    "retrogradeEntries": 18,
    "retrogradeEntryDates": 36,
    "note": "How many facts the site's test asks check_sky_fact about around these questions, all of which it answers as the key does: every sign for a question about a sign, the question itself for whether a planet was retrograde, every date the key accepts and the date either side for a date answer, and every date holding an entry into a sign while retrograde in an ingress question's period."
  },
  "answers": [
    {"id":"si-001","request":{"kind":"sign","body":"Sun","sign":"aquarius","instant":"1985-02-15T23:26:00Z"},"reply":{"schema":"zodiacs.compute-api.sky-fact.v1","result":{"answer":"true","basis":"instant","fact":{"kind":"sign","body":"Sun","sign":"aquarius","instant":"1985-02-15T23:26:00.000Z","date":null,"zone":null},"instant":"1985-02-15T23:26:00.000Z","window":null,"zone":null,"facts":{"lon":327.23679195329044,"sign":"aquarius","degree":27.236791953290435,"speed":1.0100067561609194,"retrograde":false,"deltaT":{"seconds":54.41097637939453,"sigma":0.0010609999999999999,"model":"iers-utc/1","table":"2026-09-24","tableDigest":"064d98b4a531053a","segment":"observed"},"timeScale":{"input":"utc","basis":"iers","ut1MinusUtc":{"seconds":-0.2269763888888896,"sigma":0.0010609999999999999,"source":"observed"},"leapSeconds":{"taiMinusUtc":22,"listed":true}},"boundaryMarginArcsec":9947.548968154433,"flags":[]}},"receipt":{"schema":"zodiacs.compute-receipt.v1","endpoint":"sky-fact","engine":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"conventions":{"angles":"gast-and-true-obliquity","aspects":"major-aspects;sun-moon-eight-planets;no-nodes;applying-instantaneous-orb-rate","calendar":"proleptic-gregorian","deltaT":"tt-minus-ut1;value-in-result","localTime":"tzdb-shards-before-1970;host-intl-from-1970;flags-from-transition-record","longitudeUnit":"degrees-[0,360)","moonNodes":"instantaneous-geocentric-moon-orbit-plane","moonPosition":"astronomy-engine-geo-moon;no-light-time;no-aberration","nutation":"iau2000b;equation-of-equinoxes-with-two-complementary-terms","planetPositions":"aberrated-geocentric-ecliptic-of-date;no-deflection","speed":"degrees-per-day;central-difference-plus-minus-0.001-day;nodes-plus-minus-0.25-day","timeScale":"tt-from-leap-seconds-and-ut1-from-iers-1972-to-table-end;delta-t-model-otherwise;in-result","zodiac":"tropical"},"coverage":{"angleExclusions":"exact-geographic-poles-and-ecliptic-horizon-coincidence","assessment":"finite-reference-cases-only","broadDateRange":"not-certified","inputSyntax":"not-an-astronomical-accuracy-guarantee"},"referenceSpan":{"from":"1800-01-01T00:00:00.000Z","to":"2200-01-01T00:00:00.000Z"},"deltaT":[{"model":"iers-utc/1","table":"2026-09-24","tableDigest":"064d98b4a531053a"},{"model":"zodiacs-deltat/1","table":"2026-09-24","tableDigest":"6371988c510a1c6c"}]},"backend":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"cite":{"url":"https://zodiacs.org/developers/mcp/#check_sky_fact","receipt":"sha256:fe3f71fb8dccdbfbc5c4837c08c117ad2b8f01f72cfe9261b3b0d51d642c7056","engine":"@zodiacs/engine","version":"0.1.1-rc.16"}}},
    {"id":"si-002","request":{"kind":"sign","body":"Moon","sign":"scorpio","instant":"1939-12-08T16:35:00Z"},"reply":{"schema":"zodiacs.compute-api.sky-fact.v1","result":{"answer":"true","basis":"instant","fact":{"kind":"sign","body":"Moon","sign":"scorpio","instant":"1939-12-08T16:35:00.000Z","date":null,"zone":null},"instant":"1939-12-08T16:35:00.000Z","window":null,"zone":null,"facts":{"lon":228.13803892046022,"sign":"scorpio","degree":18.13803892046019,"speed":13.663313821183465,"retrograde":false,"deltaT":{"seconds":24.408846966895588,"sigma":0.46,"model":"zodiacs-deltat/1","table":"2026-09-24","tableDigest":"6371988c510a1c6c","segment":"reconstructed"},"timeScale":{"input":"utc","basis":"delta-t","ut1MinusUtc":null,"leapSeconds":null},"boundaryMarginArcsec":42703.05988634322,"flags":[]}},"receipt":{"schema":"zodiacs.compute-receipt.v1","endpoint":"sky-fact","engine":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"conventions":{"angles":"gast-and-true-obliquity","aspects":"major-aspects;sun-moon-eight-planets;no-nodes;applying-instantaneous-orb-rate","calendar":"proleptic-gregorian","deltaT":"tt-minus-ut1;value-in-result","localTime":"tzdb-shards-before-1970;host-intl-from-1970;flags-from-transition-record","longitudeUnit":"degrees-[0,360)","moonNodes":"instantaneous-geocentric-moon-orbit-plane","moonPosition":"astronomy-engine-geo-moon;no-light-time;no-aberration","nutation":"iau2000b;equation-of-equinoxes-with-two-complementary-terms","planetPositions":"aberrated-geocentric-ecliptic-of-date;no-deflection","speed":"degrees-per-day;central-difference-plus-minus-0.001-day;nodes-plus-minus-0.25-day","timeScale":"tt-from-leap-seconds-and-ut1-from-iers-1972-to-table-end;delta-t-model-otherwise;in-result","zodiac":"tropical"},"coverage":{"angleExclusions":"exact-geographic-poles-and-ecliptic-horizon-coincidence","assessment":"finite-reference-cases-only","broadDateRange":"not-certified","inputSyntax":"not-an-astronomical-accuracy-guarantee"},"referenceSpan":{"from":"1800-01-01T00:00:00.000Z","to":"2200-01-01T00:00:00.000Z"},"deltaT":[{"model":"iers-utc/1","table":"2026-09-24","tableDigest":"064d98b4a531053a"},{"model":"zodiacs-deltat/1","table":"2026-09-24","tableDigest":"6371988c510a1c6c"}]},"backend":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"cite":{"url":"https://zodiacs.org/developers/mcp/#check_sky_fact","receipt":"sha256:fe3f71fb8dccdbfbc5c4837c08c117ad2b8f01f72cfe9261b3b0d51d642c7056","engine":"@zodiacs/engine","version":"0.1.1-rc.16"}}},
    {"id":"si-003","request":{"kind":"sign","body":"Mercury","sign":"sagittarius","instant":"1921-12-23T14:58:00Z"},"reply":{"schema":"zodiacs.compute-api.sky-fact.v1","result":{"answer":"true","basis":"instant","fact":{"kind":"sign","body":"Mercury","sign":"sagittarius","instant":"1921-12-23T14:58:00.000Z","date":null,"zone":null},"instant":"1921-12-23T14:58:00.000Z","window":null,"zone":null,"facts":{"lon":268.9609201408773,"sign":"sagittarius","degree":28.960920140877306,"speed":1.5805304953744326,"retrograde":false,"deltaT":{"seconds":22.679801208928346,"sigma":0.46,"model":"zodiacs-deltat/1","table":"2026-09-24","tableDigest":"6371988c510a1c6c","segment":"reconstructed"},"timeScale":{"input":"utc","basis":"delta-t","ut1MinusUtc":null,"leapSeconds":null},"boundaryMarginArcsec":3740.6874928416983,"flags":[]}},"receipt":{"schema":"zodiacs.compute-receipt.v1","endpoint":"sky-fact","engine":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"conventions":{"angles":"gast-and-true-obliquity","aspects":"major-aspects;sun-moon-eight-planets;no-nodes;applying-instantaneous-orb-rate","calendar":"proleptic-gregorian","deltaT":"tt-minus-ut1;value-in-result","localTime":"tzdb-shards-before-1970;host-intl-from-1970;flags-from-transition-record","longitudeUnit":"degrees-[0,360)","moonNodes":"instantaneous-geocentric-moon-orbit-plane","moonPosition":"astronomy-engine-geo-moon;no-light-time;no-aberration","nutation":"iau2000b;equation-of-equinoxes-with-two-complementary-terms","planetPositions":"aberrated-geocentric-ecliptic-of-date;no-deflection","speed":"degrees-per-day;central-difference-plus-minus-0.001-day;nodes-plus-minus-0.25-day","timeScale":"tt-from-leap-seconds-and-ut1-from-iers-1972-to-table-end;delta-t-model-otherwise;in-result","zodiac":"tropical"},"coverage":{"angleExclusions":"exact-geographic-poles-and-ecliptic-horizon-coincidence","assessment":"finite-reference-cases-only","broadDateRange":"not-certified","inputSyntax":"not-an-astronomical-accuracy-guarantee"},"referenceSpan":{"from":"1800-01-01T00:00:00.000Z","to":"2200-01-01T00:00:00.000Z"},"deltaT":[{"model":"iers-utc/1","table":"2026-09-24","tableDigest":"064d98b4a531053a"},{"model":"zodiacs-deltat/1","table":"2026-09-24","tableDigest":"6371988c510a1c6c"}]},"backend":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"cite":{"url":"https://zodiacs.org/developers/mcp/#check_sky_fact","receipt":"sha256:fe3f71fb8dccdbfbc5c4837c08c117ad2b8f01f72cfe9261b3b0d51d642c7056","engine":"@zodiacs/engine","version":"0.1.1-rc.16"}}},
    {"id":"si-004","request":{"kind":"sign","body":"Venus","sign":"leo","instant":"2046-09-03T11:59:00Z"},"reply":{"schema":"zodiacs.compute-api.sky-fact.v1","result":{"answer":"true","basis":"instant","fact":{"kind":"sign","body":"Venus","sign":"leo","instant":"2046-09-03T11:59:00.000Z","date":null,"zone":null},"instant":"2046-09-03T11:59:00.000Z","window":null,"zone":null,"facts":{"lon":149.96915696546318,"sign":"leo","degree":29.969156965463185,"speed":1.237011617575945,"retrograde":false,"deltaT":{"seconds":71.16104281852316,"sigma":9.860495216122839,"model":"zodiacs-deltat/1","table":"2026-09-24","tableDigest":"6371988c510a1c6c","segment":"extrapolated"},"timeScale":{"input":"utc","basis":"delta-t","ut1MinusUtc":{"seconds":0,"sigma":0.9,"source":"fallback"},"leapSeconds":null},"boundaryMarginArcsec":111.0349243325345,"flags":[]}},"receipt":{"schema":"zodiacs.compute-receipt.v1","endpoint":"sky-fact","engine":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"conventions":{"angles":"gast-and-true-obliquity","aspects":"major-aspects;sun-moon-eight-planets;no-nodes;applying-instantaneous-orb-rate","calendar":"proleptic-gregorian","deltaT":"tt-minus-ut1;value-in-result","localTime":"tzdb-shards-before-1970;host-intl-from-1970;flags-from-transition-record","longitudeUnit":"degrees-[0,360)","moonNodes":"instantaneous-geocentric-moon-orbit-plane","moonPosition":"astronomy-engine-geo-moon;no-light-time;no-aberration","nutation":"iau2000b;equation-of-equinoxes-with-two-complementary-terms","planetPositions":"aberrated-geocentric-ecliptic-of-date;no-deflection","speed":"degrees-per-day;central-difference-plus-minus-0.001-day;nodes-plus-minus-0.25-day","timeScale":"tt-from-leap-seconds-and-ut1-from-iers-1972-to-table-end;delta-t-model-otherwise;in-result","zodiac":"tropical"},"coverage":{"angleExclusions":"exact-geographic-poles-and-ecliptic-horizon-coincidence","assessment":"finite-reference-cases-only","broadDateRange":"not-certified","inputSyntax":"not-an-astronomical-accuracy-guarantee"},"referenceSpan":{"from":"1800-01-01T00:00:00.000Z","to":"2200-01-01T00:00:00.000Z"},"deltaT":[{"model":"iers-utc/1","table":"2026-09-24","tableDigest":"064d98b4a531053a"},{"model":"zodiacs-deltat/1","table":"2026-09-24","tableDigest":"6371988c510a1c6c"}]},"backend":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"cite":{"url":"https://zodiacs.org/developers/mcp/#check_sky_fact","receipt":"sha256:fe3f71fb8dccdbfbc5c4837c08c117ad2b8f01f72cfe9261b3b0d51d642c7056","engine":"@zodiacs/engine","version":"0.1.1-rc.16"}}},
    {"id":"si-005","request":{"kind":"sign","body":"Mars","sign":"taurus","instant":"2013-05-24T07:02:00Z"},"reply":{"schema":"zodiacs.compute-api.sky-fact.v1","result":{"answer":"true","basis":"instant","fact":{"kind":"sign","body":"Mars","sign":"taurus","instant":"2013-05-24T07:02:00.000Z","date":null,"zone":null},"instant":"2013-05-24T07:02:00.000Z","window":null,"zone":null,"facts":{"lon":54.86821665387964,"sign":"taurus","degree":24.868216653879642,"speed":0.7208017771631603,"retrograde":false,"deltaT":{"seconds":67.10272412109374,"sigma":0.000809,"model":"iers-utc/1","table":"2026-09-24","tableDigest":"064d98b4a531053a","segment":"observed"},"timeScale":{"input":"utc","basis":"iers","ut1MinusUtc":{"seconds":0.08127592592592237,"sigma":0.000809,"source":"observed"},"leapSeconds":{"taiMinusUtc":35,"listed":true}},"boundaryMarginArcsec":18474.420046033287,"flags":[]}},"receipt":{"schema":"zodiacs.compute-receipt.v1","endpoint":"sky-fact","engine":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"conventions":{"angles":"gast-and-true-obliquity","aspects":"major-aspects;sun-moon-eight-planets;no-nodes;applying-instantaneous-orb-rate","calendar":"proleptic-gregorian","deltaT":"tt-minus-ut1;value-in-result","localTime":"tzdb-shards-before-1970;host-intl-from-1970;flags-from-transition-record","longitudeUnit":"degrees-[0,360)","moonNodes":"instantaneous-geocentric-moon-orbit-plane","moonPosition":"astronomy-engine-geo-moon;no-light-time;no-aberration","nutation":"iau2000b;equation-of-equinoxes-with-two-complementary-terms","planetPositions":"aberrated-geocentric-ecliptic-of-date;no-deflection","speed":"degrees-per-day;central-difference-plus-minus-0.001-day;nodes-plus-minus-0.25-day","timeScale":"tt-from-leap-seconds-and-ut1-from-iers-1972-to-table-end;delta-t-model-otherwise;in-result","zodiac":"tropical"},"coverage":{"angleExclusions":"exact-geographic-poles-and-ecliptic-horizon-coincidence","assessment":"finite-reference-cases-only","broadDateRange":"not-certified","inputSyntax":"not-an-astronomical-accuracy-guarantee"},"referenceSpan":{"from":"1800-01-01T00:00:00.000Z","to":"2200-01-01T00:00:00.000Z"},"deltaT":[{"model":"iers-utc/1","table":"2026-09-24","tableDigest":"064d98b4a531053a"},{"model":"zodiacs-deltat/1","table":"2026-09-24","tableDigest":"6371988c510a1c6c"}]},"backend":{"name":"@zodiacs/engine","version":"0.1.1-rc.16","ephemeris":{"name":"astronomy-engine","version":"2.1.19"}},"cite":{"url":"https://zodiacs.org/developers/mcp/#check_sky_fact","receipt":"sha256:fe3f71fb8dccdbfbc5c4837c08c117ad2b8f01f72cfe9261b3b0d51d642c7056","engine":"@zodiacs/engine","version":"0.1.1-rc.16"}}},
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