ASCOM Library
Earth Class
NOVAS-COM: Represents the "state" of the Earth at a given Terrestrial Julian date
Definition
Namespace: ASCOM.Tools.NovasCom
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 2.2.1+77356f79b05b579f6d860a4edd5934fda9fe29e4
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 2.2.1+77356f79b05b579f6d860a4edd5934fda9fe29e4
C#
public class EarthVB
Public Class Earth- Inheritance
- Object Earth
Remarks
NOVAS-COM objects of class Earth represent the "state" of the Earth at a given Terrestrial Julian date.
The state includes barycentric and heliocentric position vectors for the earth, plus obliquity,
nutation and the equation of the equinoxes. Unless set by the client, the Earth ephemeris used is
computed using an internal approximation. The client may optionally attach an ephemeris object for
increased Accuracy.
Ephemeris Generator
The ephemeris generator object used with NOVAS-COM must support a single
method GetPositionAndVelocity(tjd). This method must take a terrestrial Julian date (like the
NOVAS-COM methods) as its single parameter, and return an array of Double
containing the rectangular (x/y/z) heliocentric J2000 equatorial coordinates of position (AU) and velocity
(KM/sec.). In addition, it must support three read/write properties BodyType, Name, and Number,
which correspond to the Type, Name, and Number properties of Novas.Planet.
Constructors
| Earth | Create a new instance of the Earth object |
Properties
| BarycentricPosition | Earth barycentric position |
| BarycentricTime | Earth barycentric time |
| BarycentricVelocity | Earth barycentric velocity |
| EarthEphemeris | Ephemeris object used to provide the position of the Earth. |
| EquationOfEquinoxes | Earth equation of equinoxes |
| HeliocentricPosition | Earth heliocentric position |
| HeliocentricVelocity | Earth heliocentric velocity |
| MeanObliquity | Earth mean obliquity |
| NutationInLongitude | Earth nutation in longitude |
| NutationInObliquity | Earth nutation in obliquity |
| TrueObliquity | Earth true obliquity |
Methods
| SetForTime | Initialize the Earth object for given terrestrial Julian date |