{"id": "card_works_haversine", "kind": "verified", "title": "The great-circle distance from New York to London", "body": "Across the curved Earth, the shortest path (the haversine great-circle distance) from New York to London is about 5,570 km — the number behind every flight plan and GPS fix.  Worked & sealed by the engine — haversine(NYC → London) ≈ 5,570 km.  [HOLDS; open the seal to re-check.]", "source": {"label": "The Works — worked & sealed", "url": "https://narrowhighway.com/s/976282b6b2debdaf0d730adbdf0bda0ea0bd82949644755880812aca49a46c9f", "domain": "geography", "authority_tier": "verified"}, "shelf": "the-works", "box": "earth_life", "bands": ["the-works", "earth_life", "geography", "geodesy"], "connections": [{"to_card_id": "card_spine_the-works", "relationship": "member_of", "evidence": "a member of the the-works shelf in the keeping"}, {"to_card_id": "card_k_floor_of_discovery", "relationship": "paves", "evidence": "A worked, engine-sealed demonstration — a paving-stone of the floor of reality."}, {"to_card_id": "card_v_b40dade5fd6b", "relationship": "demonstrates", "evidence": "A worked demonstration in the same field (geography)."}, {"to_card_id": "card_v_e9a9cfd0bf9a", "relationship": "demonstrates", "evidence": "A worked demonstration in the same field (geography)."}, {"to_card_id": "card_works_carbon", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}, {"to_card_id": "card_works_nested_control", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "subject": "Geodesy", "extra": {"seal_hash": "976282b6b2debdaf0d730adbdf0bda0ea0bd82949644755880812aca49a46c9f", "cite_url": "https://narrowhighway.com/s/976282b6b2debdaf0d730adbdf0bda0ea0bd82949644755880812aca49a46c9f", "demonstration_id": "works_haversine", "verdict": "HOLDS"}, "presentation": {"glyph": "•", "kind_label": "earth life", "by": "The Works — worked & sealed", "authority": "verified", "posted": "", "standing": "", "link": {"url": "https://narrowhighway.com/s/976282b6b2debdaf0d730adbdf0bda0ea0bd82949644755880812aca49a46c9f", "host": "narrowhighway.com", "provider": "", "titled": "The great-circle distance from New York to London", "waybill_line": "", "reach": "", "embed": ""}}, "neighbors": [{"id": "card_spine_the-works", "title": "The Works — sealed, worked demonstrations", "relationship": "on the shelf of", "why": "a member of the the-works shelf in the keeping", "href": "/card/card_spine_the-works", "resolved": true}, {"id": "card_k_floor_of_discovery", "title": "The Floor of Discovery — one floor, and by its design the fear of God", "relationship": "paves", "why": "A worked, engine-sealed demonstration — a paving-stone of the floor of reality.", "href": "/card/card_k_floor_of_discovery", "resolved": true}, {"id": "card_v_b40dade5fd6b", "title": "haversine(NYC → London) ≈ 5,570 km", "relationship": "demonstrates", "why": "A worked demonstration in the same field (geography).", "href": "/card/card_v_b40dade5fd6b", "resolved": true}, {"id": "card_v_e9a9cfd0bf9a", "title": "haversine(0,0 → 0,1°) ≈ 111.19 km", "relationship": "demonstrates", "why": "A worked demonstration in the same field (geography).", "href": "/card/card_v_e9a9cfd0bf9a", "resolved": true}, {"id": "card_works_carbon", "title": "The carbon cost of a hundred kilometres", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_carbon", "resolved": true}, {"id": "card_works_nested_control", "title": "The nested control-systems rule: meet a failure at its own layer", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_nested_control", "resolved": true}]}