{ "$schema": "https://ontarionightsky.com/schemas/near-snapshot.v1.json", "version": "1.0", "generatedAt": "2026-08-15T02:05:10.326Z", "snapshotMeta": { "schemaVersion": "1.0", "tieBreakVersion": "2.0.0", "metricsVersion": "1.2.0", "ladder": [ "verdictRank (desc)", "windowHours (desc)", "windowMeanCloudPct (asc)", "tonightMinCloudPct (asc)", "tonightMeanCloudPct (asc)", "bortle (asc — darker wins)", "distanceKm (asc)" ], "changelog": [ { "version": "1.2.0", "date": "2026-04-26", "type": "metrics", "summary": "Added `tieBreakComparisons[]` to each item: per-step a/b values, equality flag, winner, and `decidedBy` marker for the rule that broke the tie." }, { "version": "2.0.0", "date": "2026-04-26", "type": "tieBreak", "summary": "Replaced verdict+distance-only ranking with 7-level ladder (verdict, window length, window cloud, min/mean cloud, bortle, distance)." }, { "version": "1.1.0", "date": "2026-04-26", "type": "metrics", "summary": "Added per-site `tieBreak` block (windowHours, windowMeanCloudPct, tonightMinCloudPct, tonightMeanCloudPct, bortle) for transparency." }, { "version": "1.0.0", "date": "2026-04-25", "type": "schema", "summary": "Initial near-snapshot.v1 schema with bestTonight + closestSites[]." } ], "docs": "https://ontarionightsky.com/llms.txt" }, "city": { "id": "sudbury", "name": "Sudbury", "region": "Northeastern Ontario", "lat": 46.4917, "lon": -80.993, "population": 166000 }, "page": { "url": "https://ontarionightsky.com/near/sudbury/", "html": "https://ontarionightsky.com/near/sudbury/", "json": "https://ontarionightsky.com/near/sudbury/snapshot.json" }, "tieBreakLadder": [ "verdictRank (desc)", "windowHours (desc)", "windowMeanCloudPct (asc)", "tonightMinCloudPct (asc)", "tonightMeanCloudPct (asc)", "bortle (asc — darker wins)", "distanceKm (asc)" ], "bestTonight": { "siteId": "bruce-peninsula", "name": "Bruce Peninsula", "distanceKm": 146.4, "bortle": 3, "url": "https://ontarionightsky.com/site/bruce-peninsula/", "forecastUrl": "https://ontarionightsky.com/?site=bruce-peninsula", "tonight": { "date": "2026-08-14T20:35", "nightStartIso": "2026-08-14T20:35", "nightEndIso": "2026-08-15T06:27", "moonPhase": "New moon", "moonIlluminationPct": 2, "verdict": "Excellent", "verdictReason": "10h of clear sky (≤30% cloud) during tonight's astronomical night, mean cloud 1%.", "confidence": "High", "meanCloudPct": 1, "minCloudPct": 0, "bestWindow": { "startIso": "2026-08-14T21:00:00.000Z", "endIso": "2026-08-15T06:00:00.000Z", "hours": 10, "meanCloudPct": 1 } }, "tieBreak": { "verdict": "Excellent", "verdictRank": 5, "windowHours": 10, "windowMeanCloudPct": 1, "tonightMinCloudPct": 0, "tonightMeanCloudPct": 1, "bortle": 3, "distanceKm": 146.4 }, "tieBreakComparisons": [ { "vsSiteId": "killarney", "vsName": "Killarney", "steps": [ { "field": "verdictRank", "direction": "desc", "a": 5, "b": 5, "equal": true, "winner": null, "decidedBy": false }, { "field": "windowHours", "direction": "desc", "a": 10, "b": 4, "equal": false, 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"tonightMinCloudPct", "direction": "asc", "a": 0, "b": 0, "equal": true, "winner": null, "decidedBy": false }, { "field": "tonightMeanCloudPct", "direction": "asc", "a": 1, "b": 14, "equal": false, "winner": "a", "decidedBy": false }, { "field": "bortle", "direction": "asc", "a": 3, "b": 3, "equal": true, "winner": null, "decidedBy": false }, { "field": "distanceKm", "direction": "asc", "a": 146.4, "b": 211.4, "equal": false, "winner": "a", "decidedBy": false } ] } ] }, "closestSites": [ { "rank": 1, "siteId": "killarney", "name": "Killarney", "region": "Georgian Bay, ON", "bortle": 2, "lat": 46.0167, "lon": -81.4, "distanceKm": 61.4, "url": "https://ontarionightsky.com/site/killarney/", "forecastUrl": "https://ontarionightsky.com/?site=killarney", "snapshotUrl": "https://ontarionightsky.com/sites/killarney.snapshot.json", "tonight": { "date": "2026-08-14T20:36", "nightStartIso": "2026-08-14T20:36", "nightEndIso": "2026-08-15T06:25", "moonPhase": "New moon", "moonIlluminationPct": 2, 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"winner": "b", "decidedBy": false } ] }, { "vsSiteId": "manitoulin", "vsName": "Manitoulin (Gordon's Park)", "steps": [ { "field": "verdictRank", "direction": "desc", "a": 5, "b": 5, "equal": true, "winner": null, "decidedBy": false }, { "field": "windowHours", "direction": "desc", "a": 10, "b": 10, "equal": true, "winner": null, "decidedBy": false }, { "field": "windowMeanCloudPct", "direction": "asc", "a": 1, "b": 2, "equal": false, "winner": "a", "decidedBy": true }, { "field": "tonightMinCloudPct", "direction": "asc", "a": 0, "b": 0, "equal": true, "winner": null, "decidedBy": false }, { "field": "tonightMeanCloudPct", "direction": "asc", "a": 1, "b": 2, "equal": false, "winner": "a", "decidedBy": false }, { "field": "bortle", "direction": "asc", "a": 3, "b": 2, "equal": false, "winner": "b", "decidedBy": false }, { "field": "distanceKm", "direction": "asc", "a": 146.4, "b": 122.5, "equal": false, "winner": "b", "decidedBy": false } ] }, { "vsSiteId": "torrance-barrens", "vsName": 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