| UTC minus TAI | The differences between UTC function and TAI.
NB: UTC is NOT time, but a non-differentiable
function of time. Units: secobds |
| UT1 minus TAI |
Parameter UT1 describes orientation of the Earth with respect to
the axis of its rotation. It is defined as a prturbational ngle
with respect to a uniform rotation with nominal angular
velocity 7.292115146706979 · 10-5 rad/sec.
Units: seconds.
|
| X pole coordinate |
Parameter X pole coordinate describes the offset of the Earth's pole
in the crust-fixed coordinate system along the Greenwich meridian
towards axis X. Units: arcseconds.
|
| Y pole coordinate |
Parameter Y pole coordinate describes the offset of the Earth's pole
in the crust-fixed coordinate system along the meridian 90°
west, opposite to axis Y. Units: arcseconds.
|
| Nutation offset Δψ |
|
| Nutation offset Δε |
|
| Euler angle 1 |
Euler angle with respect to axis 1. Does not take into account
harmonic terms. Units: rad.
|
| Euler angle 2 |
Euler angle with respect to axis 2. Does not take into account
harmonic terms. Units: rad.
|
| Euler angle 3 |
Perturbation of the Euler angle with respect to axis 3 after subtraction
a linear trend with angular velocity
7.292115146706979 · 10-5 rad/sec.
Does not take into account harmonic terms with periods less than 4 days.
Units: rad.
|
| Length of day |
|
| UT1 rate |
|
| X pole rate |
Rate of change of X pole coordinate.
Units: arcsec/day.
|
| Y pole rate |
Rate of change of Y pole coordinate.
Units: arcsec/day.
|
| Rotation matrix |
3 × 3 rotation matrix that tranforms a vector in the
crust-rfixed coordinate system in to the inertial coordinate
system for accounting the Earth rotation. The order of nine
terms: (1,1), (2,1), (3,1), (1,2), (2,2), (3,2), (1,3), (2,3), (3,3)
Units: dimensionless.
|
| Rotation matrix rate |
Time derivative of the 3 × 3 rotation matrix that transforms
a vector in the crust-rfixed coordinate system in to the inertial
coordinate system for accounting the Earth rotation. The order of nine
terms: (1,1), (2,1), (3,1), (1,2), (2,2), (3,2), (1,3), (2,3), (3,3)
Units: 1/s.
|
| Rotation matrix acceleration |
Second time derivative of the 3 × 3 rotation matrix that transforms
a vector in the crust-rfixed coordinate system in to the inertial
coordinate system for accounting the Earth rotation. The order of nine
terms: (1,1), (2,1), (3,1), (1,2), (2,2), (3,2), (1,3), (2,3), (3,3)
Units: 1/s2.
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Responsible NASA official: Leonid Petrov
|
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