{"id": "card_works_julian_day", "kind": "verified", "title": "The running day-count astronomers keep", "body": "Astronomers count time in Julian days — an unbroken tally of days. Noon on 1 January 2000 is Julian day 2,451,545, the modern epoch J2000.  Worked & sealed by the engine — JD(2000-01-01) = 2,451,545.  [HOLDS; open the seal to re-check.]", "source": {"label": "The Works — worked & sealed", "url": "https://narrowhighway.com/s/e8d820681c9422bf8715151e9a8c6ac812f6a3fe6a184702a772015e3a339686", "domain": "ephemeris", "authority_tier": "verified"}, "shelf": "the-works", "box": "physical", "bands": ["the-works", "physical", "ephemeris", "positional", "astronomy"], "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_works_element", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}, {"to_card_id": "card_works_ideal_gas", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}, {"to_card_id": "card_works_photon", "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": "Positional astronomy", "extra": {"seal_hash": "e8d820681c9422bf8715151e9a8c6ac812f6a3fe6a184702a772015e3a339686", "cite_url": "https://narrowhighway.com/s/e8d820681c9422bf8715151e9a8c6ac812f6a3fe6a184702a772015e3a339686", "demonstration_id": "works_julian_day", "verdict": "HOLDS"}, "presentation": {"glyph": "•", "kind_label": "physical", "by": "The Works — worked & sealed", "authority": "verified", "posted": "", "standing": "", "link": {"url": "https://narrowhighway.com/s/e8d820681c9422bf8715151e9a8c6ac812f6a3fe6a184702a772015e3a339686", "host": "narrowhighway.com", "provider": "", "titled": "The running day-count astronomers keep", "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_works_element", "title": "Carbon, by definition", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_element", "resolved": true}, {"id": "card_works_ideal_gas", "title": "The ideal gas law solves for temperature", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_ideal_gas", "resolved": true}, {"id": "card_works_photon", "title": "The energy in a single green photon", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_photon", "resolved": true}]}