| Name | Description |
|---|---|
| Earth | Apparent position of the Earth center as seen from the object's center. |
| Earth(True) | Vector that locates Earth center with respect to the object's center. |
| EclipticNormal | Unit vector normal to the Earth mean of J2000 epoch ecliptic plane or Z-axis of the Earth mean ecliptic of J2000 epoch axes. |
| ICRF-X | Unit vector along X-axis of the ICRF set of axes. |
| ICRF-Z | Unit vector along Z-axis of the ICRF set of axes. |
| Sun | Apparent direction from which sunlight arrives at the object's location. |
| Sun(True) | True position of the Sun center as seen from the object's center. |
STK Programming Interface 11.0.1