decimalLat | yes | | decimal degrees or degrees minutes seconds: -90.0 to 90.0 |

decimalLon | yes | | decimal degrees or degrees minutes seconds: -180.0 to 180.0 |

altitude | | 0.0 | height above WGS-84 ellipsoid of calculation location: -10 - 600 km |

elevationUnit | | K | units of elevation parameter: 'k', 'm', or 'f' |

model | yes | | which magnetic reference model to use: 'POMME' |

minYear | | current year | start year of calculation interval: 2010-2015 |

minMonth | | current month | start month of calculation interval: 1 - 12 |

minDay | | current day | start day of calculation interval: 1 - 31 |