{
  "export": {
    "source": "https://urth.darkrealm.vip/thread/urth/3011",
    "note": "Exported from an unofficial mirror of a public mailing list. Copyright in each message remains with the person who wrote it.  Email addresses are obscured as `user at host`, the form the original archive published. This file was rebuilt from parsed fields rather than retained headers, so it is faithful in content but not byte-exact.",
    "addresses": "obscured as 'user at host'"
  },
  "archive": "urth",
  "thread": {
    "id": 3011,
    "subject": "Diameter of the Old Sun",
    "messages": 1,
    "voices": 1,
    "first": "2002-03-04T00:17:51+00:00",
    "last": "2002-03-04T00:17:51+00:00"
  },
  "messages": [
    {
      "message_id": "<urth-v0203-273@digest.urth.net>",
      "from": {
        "name": "Michael Andre-Driussi",
        "address": "mantis at siriusfiction.com"
      },
      "date": "2002-03-04T00:17:51+00:00",
      "subject": "(urth) Diameter of the Old Sun",
      "in_reply_to": null,
      "reply_link": null,
      "blocks": [
        {
          "kind": "text",
          "depth": 0,
          "text": "Assuming that Lune Diameter = 2160 miles, and Orbit = 150,000 miles . . .\n\nAnd using formula S = 57.3 * D/R\n\nShows us that the angular diameter (i.e., size in sky from Urth) of Lune is\n0.82 degrees (compared with Moon from Earth as 0.52 degrees--bigger, but\nnot quite doubled in size).\n\nSupposing that the Old Sun is swollen (Supposition 1); further supposing\nthat Lune can eclipse the Old Sun (Supposition 2); this implies that the\nangular diameter of Old Sun is around 0.82 degrees (compared to Sun's 0.53\ndegrees).  What is the diameter of Old Sun?\n\n0.82 = 57.3 * x/92.960 million miles\n76.2272 = 57.3 * x\n1.3303 = x = 1.33 million miles\n\nAccording to these figurings, Old Sun has a diameter of 1.33 million miles\n(2.14 million km), which translates into 0.014 AU.\n\nIf the above is correct, then there is little hazard of the planet we call\nMercury being engulfed by the swollen star, since Mercury orbits at 0.38 AU.\n\n=mantis=\n\n\nSirius Fiction\nbooklets on Gene Wolfe, John Crowley\nNow with UPDATES!\nhttp://www.siriusfiction.com/"
        }
      ]
    }
  ]
}