Computes the position and velocity vectors of a terrestrial observer with respect to the center of the Earth.

Namespace: ASCOM.Astrometry.NOVAS
Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 6.0.0.0 (6.1.1.2619)

Syntax

C#
public static void Terra(
	ref SiteInfo locale,
	double st,
	ref double[] pos,
	ref double[] vel
)
Visual Basic
Public Shared Sub Terra ( _
	ByRef locale As SiteInfo, _
	st As Double, _
	ByRef pos As Double(), _
	ByRef vel As Double() _
)
Visual C++
public:
static void Terra(
	SiteInfo% locale, 
	double st, 
	array<double>^% pos, 
	array<double>^% vel
)

Parameters

locale
Type: ASCOM.Astrometry..::..SiteInfo%
Longitude, latitude and height of the observer (in a SiteInfoStruct)
st
Type: System..::..Double
Local apparent sidereal time at reference meridian in hours.
pos
Type: array<System..::..Double>[]()[][]%
Position vector of observer with respect to center of Earth, equatorial rectangular coordinates, referred to true equator and equinox of date, components in AU.
vel
Type: array<System..::..Double>[]()[][]%
Velocity vector of observer with respect to center of Earth, equatorial rectangular coordinates, referred to true equator and equinox of date, components in AU/Day.

Remarks