{"query": "The calendar — keeping time by sun and number", "count": 20, "results": [{"id": "card_floor_the_calendar", "title": "The calendar — keeping time by sun and number", "shelf": "codex", "surface": "secular", "snippet": "The day is one rotation (86400 s), the year one orbit (~365.2422 days); the Gregorian calendar approximates it as 365.2425 by a leap rule. Pillars rest on astronomy (the orbit and rotation) and metrol", "authority_tier": "engine_derived", "source": "Narrow Highway — cal", "readable": false, "generated": false}, {"id": "card_theory_julian_day_number", "title": "Julian Day Number (continuous astronomical time)", "shelf": "theories", "surface": "secular", "snippet": "Julian Day Number (continuous astronomical time) — an engine domain that can touch it: calendar_time. Calibration: seals — a deterministic verifier can CONFIRM or BREAK checkable claims drawn from it,", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (lone-domain seeding)", "readable": false, "generated": false}, {"id": "card_theory_historical_chronology", "title": "Historical chronology (era reckoning, elapsed years)", "shelf": "theories", "surface": "secular", "snippet": "Historical chronology (era reckoning, elapsed years) — an engine domain that can touch it: history_chronology. Calibration: seals — elapsed-year arithmetic computes exactly. Placing events on one time", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_calendar_theory", "title": "Calendar theory (Gregorian reform, leap rules)", "shelf": "theories", "surface": "secular", "snippet": "Calendar theory (Gregorian reform, leap rules) — an engine domain that can touch it: calendar_time. Calibration: seals — leap rules and date arithmetic compute exactly. The tropical year is about 365.", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_astronomical_dating", "title": "Astronomical dating (anchoring history to the sky)", "shelf": "theories", "surface": "secular", "snippet": "Astronomical dating (anchoring history to the sky) — an engine domain that can touch it: history_chronology. Calibration: partial — specific relations verify; the theory as a whole is not a sealable c", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (lone-domain seeding)", "readable": false, "generated": false}, {"id": "card_food_season", "title": "Planting by season — frost dates and timing", "shelf": "agriculture", "surface": "secular", "snippet": "Timing decides the harvest. Learn your average LAST spring frost and FIRST fall frost — the span between is your growing season. COOL-season crops (peas, lettuce, spinach, brassicas, root veg) tolerat", "authority_tier": "reference", "source": "USDA Farmers' Bulletins & extension guidance (U.S. government, public domain)", "readable": false, "generated": false}, {"id": "card_domchk_calendar_time_claimed_day_of_week", "title": "Calendar Time: day of week", "shelf": "calendar_time", "surface": "secular", "snippet": "A worked check in calendar time: day of week.\n\nGIVEN\n  date_iso = 2026-05-02\n\nCLAIMED\n  claimed_day_of_week = Saturday\n\nTHE ENGINE'S VERDICT\n  calendar_time.day_of_week: CONFIRMED — 2026-05-02 is a sa", "authority_tier": "reference", "source": "The verifier's own documented relation, and a run this engine performed against it (deterministic; re-runnable with tools/domain_goldens.py)", "readable": false, "generated": false}, {"id": "card_n_5c477e45f8d5", "title": "The calendar in the text — twelve moons, an anchorless week", "shelf": "science", "surface": "secular", "snippet": "Sealed: the year holds 12.368 lunar months — twelve tribes, twelve months, and the\n0.368 remainder is why every lunar calendar limps without leap-months. Sealed as an honest\nNEGATIVE: a lunar quarter ", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_src_openstax_astronomy_2e_4_4_the_calendar_b1642146", "title": "4.4 The Calendar — Astronomy 2e", "shelf": "astronomy", "surface": "secular", "snippet": "4.4\n\nThe Calendar\n\nLearning Objectives\n\nBy the end of this section, you will be able to:\n\nUnderstand how calendars varied among different cultures\n\nExplain the origins of our modern calendar\n\n“What’s ", "authority_tier": "reference", "source": "OpenStax: Astronomy 2e (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_astronomy_4_4_the_calendar_b1642146", "title": "4.4 The Calendar — Astronomy", "shelf": "astronomy", "surface": "secular", "snippet": "4.4\n\nThe Calendar\n\nLearning Objectives\n\nBy the end of this section, you will be able to:\n\nUnderstand how calendars varied among different cultures\n\nExplain the origins of our modern calendar\n\n“What’s ", "authority_tier": "reference", "source": "OpenStax: Astronomy (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_tool_google_calendar", "title": "Google Calendar — free everyday", "shelf": "access", "surface": "secular", "snippet": "Google Calendar: Free shared calendars for the family — plan days, set reminders, coordinate a household or a co-op.  How it's free & legal: free.  Go: https://calendar.google.com", "authority_tier": "reference", "source": "Google Calendar", "readable": false, "generated": false}, {"id": "card_domchk_calendar_time_claimed_leap", "title": "Calendar Time: leap", "shelf": "calendar_time", "surface": "secular", "snippet": "A worked check in calendar time: leap.\n\nGIVEN\n  year = 2024\n\nCLAIMED\n  claimed_leap = True\n\nTHE ENGINE'S VERDICT\n  calendar_time.leap_year: CONFIRMED — 2024 leap year = True (matches claim)\n\nAND THE F", "authority_tier": "reference", "source": "The verifier's own documented relation, and a run this engine performed against it (deterministic; re-runnable with tools/domain_goldens.py)", "readable": false, "generated": false}, {"id": "card_domchk_calendar_time_claimed_end_iso", "title": "Calendar Time: end iso", "shelf": "calendar_time", "surface": "secular", "snippet": "A worked check in calendar time: end iso.\n\nGIVEN\n  date_iso = 2026-05-02\n  duration_seconds = 86400\n\nCLAIMED\n  claimed_end_iso = 2026-05-03T00:00:00Z\n\nTHE ENGINE'S VERDICT\n  calendar_time.duration_add", "authority_tier": "reference", "source": "The verifier's own documented relation, and a run this engine performed against it (deterministic; re-runnable with tools/domain_goldens.py)", "readable": false, "generated": false}, {"id": "card_domchk_calendar_time_claimed_iso8601_valid", "title": "Calendar Time: iso8601 valid", "shelf": "calendar_time", "surface": "secular", "snippet": "A worked check in calendar time: iso8601 valid.\n\nGIVEN\n  date_iso = 2026-05-02\n  duration_seconds = 86400\n  iso8601_string = 2026-05-02T15:30:00Z\n  start_iso = 2026-05-02T00:00:00Z\n  year = 2024\n\nCLAI", "authority_tier": "reference", "source": "The verifier's own documented relation, and a run this engine performed against it (deterministic; re-runnable with tools/domain_goldens.py)", "readable": false, "generated": false}, {"id": "card_spine_domain_calendar_time", "title": "Calendar Time — what this engine can check", "shelf": "calendar_time", "surface": "secular", "snippet": "The calendar time shelf of the keeping. This engine holds a deterministic verifier for calendar time: hand it a claim in the CAL_VERIFY shape and it returns a verdict, the worked trail, and a re-check", "authority_tier": "reference", "source": "The verifier's own documented relation, and a run this engine performed against it (deterministic; re-runnable with tools/domain_goldens.py)", "readable": false, "generated": false}, {"id": "card_v_e240ccc8da0f", "title": "December 25, 2023 was a Monday · 2024 is a leap year", "shelf": "calendar_time", "surface": "secular", "snippet": "Verdict: HOLDS.\n• calendar_time.day_of_week: 2023-12-25 is a monday (matches claim)\n• calendar_time.leap_year: 2024 leap year = True (matches claim)\nSealed and independently re-checkable: https://narr", "authority_tier": "engine", "source": "Verified by the engine — calendar_time", "readable": false, "generated": false}, {"id": "card_v_fc5a446f418f", "title": "2000 is a leap year (÷400) · 2000-01-01 was a Saturday", "shelf": "calendar_time", "surface": "secular", "snippet": "Verdict: HOLDS.\n• calendar_time.leap_year: 2000 leap year = True (matches claim)\n• calendar_time.day_of_week: 2000-01-01 is a saturday (matches claim)\nSealed and independently re-checkable: https://na", "authority_tier": "engine", "source": "Verified by the engine — calendar_time", "readable": false, "generated": false}, {"id": "card_tool_proton_mail_calendar_drive", "title": "Proton (Mail · Calendar · Drive) — free everyday", "shelf": "access", "surface": "secular", "snippet": "Proton (Mail · Calendar · Drive): Free, private, encrypted email, calendar, and file storage — a privacy-respecting alternative to Big Tech for daily life.  How it's free & legal: free tier (encrypted", "authority_tier": "reference", "source": "Proton (Mail · Calendar · Drive)", "readable": false, "generated": false}, {"id": "card_seal_5f07861c7c3d0424cdeaf03ba0a243f59b2e2d0f61e38221f6e50e200c775a91", "title": "Receipt 5f07861c7c3d… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"calendar_time\",\n  \"dimensions\": [\n   \"discreteness\",\n   \"time_sequence\"\n  ]\n },\n \"gate_results\": [\n  {\n   \"details\": {\n    \"broken_at\": null,\n    \"confir", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}, {"id": "card_seal_e61074219f4e359837dae1e0427a3729442803761399765f7ced17af781067f8", "title": "Receipt e61074219f4e… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"calendar_time\",\n  \"dimensions\": [\n   \"discreteness\",\n   \"time_sequence\"\n  ]\n },\n \"gate_results\": [\n  {\n   \"details\": {\n    \"broken_at\": null,\n    \"confir", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_floor_the_calendar"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}