{"query": "The radio horizon — why towers are tall", "count": 20, "results": [{"id": "card_n_9ab6ee5e792c", "title": "The radio horizon — why towers are tall", "shelf": "science", "surface": "secular", "snippet": "Pure geometry, sealed: from height h the horizon lies at √(2hR) — a 100 m tower\nreaches 35,695 m ≈ 35.7 km: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7bc986c323", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_theory_dynamical_systems___deterministic_chaos", "title": "Dynamical systems & deterministic chaos", "shelf": "theories", "surface": "secular", "snippet": "Dynamical systems & deterministic chaos — an engine domain that can touch it: mathematics. Calibration: map-only — sensitivity is qualitative; specific trajectories compute. Deterministic rules whose ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_general_relativity", "title": "General relativity", "shelf": "theories", "surface": "secular", "snippet": "General relativity — an engine domain that can touch it: physics. Calibration: partial — specific relations verify; the field equations as a whole are map-only. Gravity is not a force but the CURVATUR", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_celestial_mechanics_ephemeris_prediction", "title": "Celestial mechanics / ephemeris prediction", "shelf": "theories", "surface": "secular", "snippet": "Celestial mechanics / ephemeris prediction — an engine domain that can touch it: ephemeris. Calibration: seals — a deterministic verifier can CONFIRM or BREAK checkable claims drawn from it. Computing", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_explore_exploit", "title": "Explore versus exploit (the multi-armed bandit)", "shelf": "theories", "surface": "secular", "snippet": "Explore versus exploit (the multi-armed bandit) — an engine domain that can touch it: operations_research. Calibration: map-only — regret bounds are asymptotic; specific policies compute. When you mus", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_src_word_horizon", "title": "horizon", "shelf": "dictionary", "surface": "secular", "snippet": "horizon: (noun) the line at which the sky and Earth appear to meet — syn: apparent horizon, visible horizon, sensible horizon, skyline · (noun) the range of interest or activity that can be anticipate", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_apparent_horizon", "title": "apparent horizon", "shelf": "dictionary", "surface": "secular", "snippet": "apparent horizon: (noun) the line at which the sky and Earth appear to meet — syn: horizon, visible horizon, sensible horizon, skyline", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_sensible_horizon", "title": "sensible horizon", "shelf": "dictionary", "surface": "secular", "snippet": "sensible horizon: (noun) the line at which the sky and Earth appear to meet — syn: horizon, apparent horizon, visible horizon, skyline", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_visible_horizon", "title": "visible horizon", "shelf": "dictionary", "surface": "secular", "snippet": "visible horizon: (noun) the line at which the sky and Earth appear to meet — syn: horizon, apparent horizon, sensible horizon, skyline", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_b_horizon", "title": "b-horizon", "shelf": "dictionary", "surface": "secular", "snippet": "b-horizon: (noun) immediately below the A-horizon; contains deposits of organic matter leached from surface soils — syn: B horizon", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_artificial_horizon", "title": "artificial horizon", "shelf": "dictionary", "surface": "secular", "snippet": "artificial horizon: (noun) a navigational instrument based on a gyroscope; it artificially provides a simulated horizon for the pilot — syn: gyro horizon, flight indicator", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_gyro_horizon", "title": "gyro horizon", "shelf": "dictionary", "surface": "secular", "snippet": "gyro horizon: (noun) a navigational instrument based on a gyroscope; it artificially provides a simulated horizon for the pilot — syn: artificial horizon, flight indicator", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_celestial_horizon", "title": "celestial horizon", "shelf": "dictionary", "surface": "secular", "snippet": "celestial horizon: (noun) the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth — syn: horizon", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_place_12719791", "title": "South Horizons (Estate)", "shelf": "geography", "surface": "secular", "snippet": "South Horizons (Estate): a place in HK, HSO at 22.244, 114.146, population 29,180. Feature PPL, timezone Asia/Hong_Kong.", "authority_tier": "reference", "source": "GeoNames (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_book_71605", "title": "Horizons and landmarks — Sidney Royse Lysaght", "shelf": "gutenberg", "surface": "secular", "snippet": "Horizons and landmarks, by Sidney Royse Lysaght. Subjects: Poetry. Read the full text (public domain): https://www.gutenberg.org/ebooks/71605", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}, {"id": "card_c_9610a78874eb", "title": "The radio horizon — why towers are tall ↔ FM broadcast (VHF) — three-meter waves, line", "shelf": "connections", "surface": null, "snippet": "Every VHF/FM/TV coverage map is this square root wearing terrain.  — a concord the card itself states; mined + verified.", "authority_tier": "engine_derived", "source": "Concordance miner — 2026-07-11", "readable": false, "generated": false}, {"id": "card_src_fed_cenozoicmammalho00osbo", "title": "Cenozoic mammal horizons of western North America", "shelf": "geology", "surface": "secular", "snippet": "Cenozoic mammal horizons of western North America. A United States federal publication, public domain (17 USC 105). The full text (408,797 bytes) is held on the ark; waybill sha256 9c45777a86ca7cef…; ", "authority_tier": "reference", "source": "US Geological Survey publications (PD, 17 USC 105)", "readable": true, "generated": false}, {"id": "card_n_51ecbfa0bb5a", "title": "The radio spectrum — one law from the cavity to the eye", "shelf": "science", "surface": "secular", "snippet": "Walk the dial upward and nothing changes but the number: λ·f = c the whole\nway. Twelve rungs sealed in ONE receipt: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7b", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_src_word_geological_horizon", "title": "geological horizon", "shelf": "dictionary", "surface": "secular", "snippet": "geological horizon: (noun) a layer of rock with a particular composition (especially of fossils); for dating the stratum", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_book_8569", "title": "The Far Horizon — Lucas Malet", "shelf": "gutenberg", "surface": "secular", "snippet": "The Far Horizon, by Lucas Malet. Subjects: Fiction. Read the full text (public domain): https://www.gutenberg.org/ebooks/8569", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "readable": true, "generated": false}]}