[
 {
  "value": "365.24219",
  "sigma": "0.00001",
  "source": "Explanatory Supplement to the Astronomical Almanac, tropical year",
  "year": "2013",
  "field": "astronomy",
  "id": "Q20",
  "unit": "d",
  "quantity": "tropical year",
  "grade": "recalled standard value, PRIOR-ART row 20",
  "bound_low": "",
  "bound_high": "",
  "recalled": "yes"
 },
 {
  "value": "365.256363",
  "sigma": "0.000001",
  "source": "Explanatory Supplement, sidereal year",
  "year": "2013",
  "field": "astronomy",
  "id": "Q21",
  "unit": "d",
  "quantity": "sidereal year",
  "grade": "recalled standard value, PRIOR-ART row 20",
  "bound_low": "",
  "bound_high": "",
  "recalled": "yes"
 },
 {
  "value": "29.530589",
  "sigma": "0.000001",
  "source": "Explanatory Supplement, synodic month",
  "year": "2013",
  "field": "astronomy",
  "id": "Q22",
  "unit": "d",
  "quantity": "synodic month",
  "grade": "recalled standard value, PRIOR-ART row 20",
  "bound_low": "",
  "bound_high": "",
  "recalled": "yes"
 },
 {
  "value": "27.321661",
  "sigma": "0.000001",
  "source": "Explanatory Supplement, sidereal month",
  "year": "2013",
  "field": "astronomy",
  "id": "Q23",
  "unit": "d",
  "quantity": "sidereal month",
  "grade": "recalled standard value, PRIOR-ART row 20",
  "bound_low": "",
  "bound_high": "",
  "recalled": "yes"
 },
 {
  "value": "58.6462",
  "sigma": "0.0001",
  "source": "Margot et al. / JPL, Mercury sidereal rotation",
  "year": "2012",
  "field": "astronomy",
  "id": "Q24",
  "unit": "d",
  "quantity": "Mercury rotation period",
  "grade": "recalled standard value, PRIOR-ART row 20",
  "bound_low": "",
  "bound_high": "",
  "recalled": "yes"
 },
 {
  "value": "87.9691",
  "sigma": "0.0001",
  "source": "JPL, Mercury sidereal orbit",
  "year": "2012",
  "field": "astronomy",
  "id": "Q25",
  "unit": "d",
  "quantity": "Mercury orbital period",
  "grade": "recalled standard value, PRIOR-ART row 20",
  "bound_low": "",
  "bound_high": "",
  "recalled": "yes"
 },
 {
  "value": "1.769137786",
  "sigma": "0.000000001",
  "source": "JPL satellite mean elements, Io sidereal period",
  "year": "2012",
  "field": "astronomy",
  "id": "Q26",
  "unit": "d",
  "quantity": "Io orbital period",
  "grade": "recalled standard value, PRIOR-ART row 20",
  "bound_low": "",
  "bound_high": "",
  "recalled": "yes"
 },
 {
  "value": "3.551181041",
  "sigma": "0.000000001",
  "source": "JPL satellite mean elements, Europa",
  "year": "2012",
  "field": "astronomy",
  "id": "Q27",
  "unit": "d",
  "quantity": "Europa orbital period",
  "grade": "recalled standard value, PRIOR-ART row 20",
  "bound_low": "",
  "bound_high": "",
  "recalled": "yes"
 },
 {
  "value": "7.15455296",
  "sigma": "0.00000001",
  "source": "JPL satellite mean elements, Ganymede",
  "year": "2012",
  "field": "astronomy",
  "id": "Q28",
  "unit": "d",
  "quantity": "Ganymede orbital period",
  "grade": "recalled standard value, PRIOR-ART row 20",
  "bound_low": "",
  "bound_high": "",
  "recalled": "yes"
 }
]