Definitions

Definitions of astronomical values returned in response fields

Response fields are defined here.

Parameter	Units	Description
apparentCoordinates	degrees	equatorial right ascension (ra, α) and declination (decl, δ)
apparentLongitude	degrees	apparent geocentric ecliptic longitude (λ)
argOfLatitude	degrees	Moon's argument of latitude: the mean distance of the Moon from its ascending node
dateTD	none	Time stamp in dynamical time, i.e. adjusted for deltaT
eclipticCoordinates	degrees	geocentric ecliptic longitude (λ) and latitude (β) of the body referenced to the true equinox of date
equatorialHorizontalParallax	degrees	parallax that varies with the rotation of the Earth or with a difference in location on the Earth; typically only significant for the Moon
jde	none	Julian Ephemeris Day, i.e. Julian Day adjusted for deltaT expressed as fractional day
meanAnomalyMoon	degrees	mean anomaly of the Moon
meanAnomalySun	degrees	mean anomaly of the Sun
meanElongation	degrees	The Moon's instantaneous angular distance east of the Sun
nutationInLongitude	degrees	nutation in ecliptic longitude
nutationInObliquity	degrees	nutation in obliquity of the ecliptic
obliquityOfEcliptic	degrees	obliquity of the ecliptic: the inclination of Earth's equator with respect to the ecliptic
radiusVector	au (sun), km (moon)	distance from body to Earth, measured between centers