{
  "name": "Length of a second of longitude by latitude",
  "desc": "Ground length of one second of longitude, one second of time of longitude, and one minute of latitude on the WGS 84 ellipsoid at selected latitudes, computed two ways.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/maps/prime-meridian/",
  "from": [
    "WGS 84 ellipsoid (a = 6378137 m, 1/f = 298.257223563), as given in PROJ 9.6.0, MIT license"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "WGS 84 ellipsoid parameters (PROJ 9.6.0, MIT); computed 2026-11-01, CC BY 4.0"
  ]
}