| Name | Description |
|---|---|
| FK5-IAU76 | Earth's attitude is calculated using the FK5-IAU76 theory (i.e., the theory behind the J2000 frame). |
| ICRF | Earth's attitude expressed with respect to the ICRF frame. |
| Orientation Difference | The angle representing the difference in orientation between the J2000 and ICRF axes at the given time. |
STK Programming Interface 11.0.1