IersTechnicalNote21 Class |
Provides Earth orientation parameters according to the IERS Technical Note 21.
Inheritance HierarchyNamespace: AGI.Foundation.Celestial
Assembly: AGI.Foundation.Models (in AGI.Foundation.Models.dll) Version: 24.1.418.0 (24.1.418.0)
SyntaxThe IersTechnicalNote21 type exposes the following members.
Properties| Name | Description | |
|---|---|---|
  | Updated1980NutationModel |
Gets an instance of the nutation model published by the
IERS in 1996 to modify the fundamental arguments of the
IAU1980 Nutation theory.
|
| UpdatedEquationOfEquinoxes |
Gets an instance of the updated equation of the equinoxes published by the
IERS in 1996. The updated equation defines the right ascension of the
mean equinox with respect to the true equator and equinox with the addition
of periodic terms involving the right ascension of the moon.
|
Methods| Name | Description | |
|---|---|---|
 | GetGreenwichHourAngle |
Computes the hour angle measured using the Greenwich mean sidereal time.
|
| GetGreenwichMeanSiderealTime |
Computes the mean sidereal time of Greenwich at the provided Julian date.
|
| GetGreenwichMeanSiderealTimeOfMidnight |
Computes the mean sidereal time of Greenwich at 0hr UT1 on the provided Julian date.
|
| GetGreenwichTrueSiderealTimeEvaluator | Gets an evaluator that computes the true sidereal time of Greenwich. The result of evaluating will be a Motion<double> which represents the value of the Greenwich true sidereal time in seconds at the given JulianDate. No derivatives are provided. |
| GetGreenwichTrueSiderealTimeEvaluator(EvaluatorGroup) | Gets an evaluator that computes the true sidereal time of Greenwich. The result of evaluating will be a Motion<double> which represents the value of the Greenwich true sidereal time in seconds at the given JulianDate. No derivatives are provided. |
See Also