{"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", "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)", "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)", "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)", "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)", "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)", "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)", "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)", "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)", "generated": false}, {"id": "card_src_word_c_horizon", "title": "c-horizon", "shelf": "dictionary", "surface": "secular", "snippet": "c-horizon: (noun) beneath the B-horizon and above the bedrock; consisting of weathered rock — syn: C horizon", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "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)", "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)", "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)", "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)", "generated": false}, {"id": "card_src_word_a_horizon", "title": "a-horizon", "shelf": "dictionary", "surface": "secular", "snippet": "a-horizon: (noun) the top layer of a soil profile; usually contains humus — syn: A horizon", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_place_13512936", "title": "New Horizons", "shelf": "geography", "surface": "secular", "snippet": "New Horizons: a place in CA, 02 at 49.281, -122.779, population 8,495. Feature PPLX, timezone America/Vancouver.", "authority_tier": "reference", "source": "GeoNames (CC-BY 4.0)", "generated": false}, {"id": "card_src_place_12719432", "title": "South Horizons", "shelf": "geography", "surface": "secular", "snippet": "South Horizons: a place in HK, HSO at 22.244, 114.148, population 29,391. Feature PPL, timezone Asia/Hong_Kong.", "authority_tier": "reference", "source": "GeoNames (CC-BY 4.0)", "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)", "generated": false}, {"id": "card_src_pron_horizons", "title": "horizons", "shelf": "pronunciation", "surface": "secular", "snippet": "horizons: pronounced (ARPABET) HH ER0 AY1 Z AH0 N Z. From the CMU Pronouncing Dictionary — the standard machine-readable pronunciations of North American English.", "authority_tier": "reference", "source": "CMU Pronouncing Dictionary (cmudict) — BSD-2-Clause, Carnegie Mellon", "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)", "generated": false}]}