Data Provider Groups | Data Provider Elements
Sun Vector
The apparent position of the Sun with respect to the object as observed from the requested coordinate system, expressed in Cartesian components, as a function of time.The light time delay is actually computed between the Sun and the object's central body, rather than directly from the object itself.
Available for these objects: Aircraft, GroundVehicle, LaunchVehicle, Missile, Satellite, Ship
Type: Time-varying data.
Availability: Reports | Graphs | Dynamic Displays | Strip Charts
Data Provider Groups
Data can be requested in a variety of coordinate systems, where the origin of the coordinate system is the object's central body. The available coordinate systems depend on the object's central body. Nominally, the systems Fixed, Inertial, J2000, TrueOfDate, and MeanOfDate are supported, although some central bodies (notably the Earth and Sun) have more.The following lists the systems available for Earth.
Name | Description |
---|---|
TrueOfDateRotating | A variation of the Fixed system where pole wander is ignored. The equator is the same as the TrueOfDate equator and the frame spins about the TrueOfDate z-axis. |
Fixed | A coordinate system attached to the central body and rotating with it. The z-axis is nominally along the rotation axis. |
ICRF | International Celestial Reference Frame. The ICRF axes are defined as the inertial (i.e., kinematically non-rotating) axes associated with a general relativity frame centered at the solar system barycenter (often called the BCRF). |
MeanOfDate | The mean equator mean equinox coordinate system evaluated at the requested time. |
MeanOfEpoch | The mean equator mean equinox coordinate system evaluated at the epoch of the object. |
TrueOfDate | The true equator true equinox coordinate system evaluated at the requested time. |
TrueOfEpoch | The true equator true equinox coordinate system evaluated at the epoch of the object. |
B1950 | The mean equator mean equinox coordinate system evaluated at the beginning of the Besselian year 1950 (31 December 1949 22:09:46.866 = JD 2433282.4234591). |
TEMEOfEpoch | The true equator mean equinox coordinate system evaluated at the epoch of the object. |
TEMEOfDate | The true equator mean equinox coordinate system evaluated at the requested time. |
AlignmentAtEpoch | The nonrotating coordinate system coincident with the Fixed system evaluated at the object's coordinate reference epoch. |
J2000 | The mean equator mean equinox coordinate system evaluated at the J2000.0 epoch (2000 January 1.5 TDB = JD 2451545.0 TDB). |
Data Provider Elements
Name | Dimension | Type | Description |
---|---|---|---|
Time | Date | Real Number or Text | Time. |
x | Distance | Real Number | The X component of the position vector. |
y | Distance | Real Number | The Y component of the position vector. |
z | Distance | Real Number | The Z component of the position vector. |