How to use the astronomia/lib/solstice.march2 function in astronomia

inYear (year) {
    let jde
    switch (this._season) {
      case 'march': {
        jde = solstice.march2(year, earth)
        break
      }
      case 'june': {
        jde = solstice.june2(year, earth)
        break
      }
      case 'september': {
        jde = solstice.september2(year, earth)
        break
      }
      case 'december': {
        jde = solstice.december2(year, earth)
        break
      }
    }