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).
| Name |
Dimension |
Type |
Description |
| Time |
DateFormat |
Real Number |
Time. |
| Right Ascen |
LongitudeUnit |
Real Number |
The signed angle measured from the X axis to the
projection of the position vector into the XY plane. The angle
increases in the direction found by the right hand rule about the Z
axis. |
| Declination |
AngleUnit |
Real Number |
The signed angle measured from the XY plane to the
position vector, where positive angles are used for locations above
the XY plane, and negative for those below. |
| Radius |
DistanceUnit |
Real Number |
The magnitude of the position vector (i.e. the
radius vector). |
| Horiz Flt Path
Ang |
AngleUnit |
Real Number |
The angle between the position vector and the plane
whose normal is the velocity vector. |
| Inertial Flt
Path Azi |
LongitudeUnit |
Real Number |
The angle, measured in the plane perpendicular to
the position vector, between the local north direction and the
projection of the velocity vector onto that plane, measured as
positive moving toward local east. |
| Inertial Vel |
Rate |
Real Number |
The magnitude of the velocity vector, as observed
in the coordinate system. |