Scenario: J2000 Angles

Earth Orientation information based on J2000 system.

Type: Time-varying data

Availability: Reports | Graphs | Dynamic Displays

Name Dimension Type Description
Time DateFormat Real Number Time.
Apparent GHA AngleUnit Real Number The sidereal Greenwich Hour Angle (GHA) that includes equation of the equinox.
Mean GHA 0hUTC AngleUnit Real Number The sidereal Greenwich Hour Angle (GHA) at 0 in Universal Time of input day. The angle does not include equation of the equinox.
Mean GHA AngleUnit Real Number The sidereal Greenwich Hour Angle (GHA) that does not include equation of the equinox.
MeanObliquity AngleUnit Real Number Obliquity of the ecliptic plane that does not include the effect of the nutation.
TrueObliquity AngleUnit Real Number Obliquity of the ecliptic plane that includes the effect of the nutation.
UT1-UTC TimeUnit Real Number The difference between Universal Time (UT1) and Coordinated Universal Time (UTC).
EqnOfEquinox AngleUnit Real Number The effect of the nutation on the Right Ascension of the equinox.
MJD Unitless Real Number Modified Julian Date (UTC time scale).
Nut. in Obliquity AngleUnit Real Number The effect of the nutation on the obliquity of the ecliptic plane.
Nut. in Longitude AngleUnit Real Number The effect of the nutation on the celestial longitude.
Pole Wander X AngleUnit Real Number Small angle related to changes in orientation of the earth pole due to continental drift.
Pole Wander Y AngleUnit Real Number Small angle related to changes in orientation of the earth pole due to continental drift.
Apparent GHA withUT1UTC AngleUnit Real Number The sidereal Greenwich Hour Angle (GHA) that accounts for the difference between UT1 and UTC time scales and includes equation of the equinox.
Mean GHA withUT1UTC AngleUnit Real Number The sidereal Greenwich Hour Angle (GHA) that accounts for the difference between UT1 and UTC time scales, but does not include equation of the equinox.
EqnOfTime TimeUnit Real Number The difference between the apparent and mean solar times.
Solar Declination AngleUnit Real Number Declination of the sun in the earth centered J2000 coordinate system.
Solar Right Ascension LongitudeUnit Real Number Right Ascension of the sun in the earth centered J2000 coordinate system.

STK Programming Interface 11.0.1