<xs:simpleType name="timeScaleType">
<xs:annotation>
<xs:documentation>The actual time scale used: TT, TAI, UTC, TDB, etc.</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:string">
<xs:enumeration value="TT">
<xs:annotation>
<xs:documentation>Terrestrial Time; the basis for ephmerides</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="TDT">
<xs:annotation>
<xs:documentation>Obsolete synonym for TT</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="ET">
<xs:annotation>
<xs:documentation>Ephemeris Time; predecessor of, and continuous with, TT</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="TEB">
<xs:annotation>
<xs:documentation>Barycentric Ephemeris Time:the independent variable in planetay ephemerides; time at the solar system barycenter synchronous with TT on an annual basis; often called TDB</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="TDB">
<xs:annotation>
<xs:documentation>Barycentric Dynamic Time: time at the solar system barycenter synchronous with TT on an annual basis; often confused with TEB</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="TCG">
<xs:annotation>
<xs:documentation>Terrestrial Coordinate Time</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="TCB">
<xs:annotation>
<xs:documentation>Barycentric Coordinate Time; runs slower than TDB but is consistent with physical constants</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="TAI">
<xs:annotation>
<xs:documentation>International Atomic Time; runs 32.184 s behind TT</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="IAT">
<xs:annotation>
<xs:documentation>Synonym for TAI</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="UTC">
<xs:annotation>
<xs:documentation>Coordinated Universal Time; currently (2004) runs 34 leapseconds behind TAI</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="LST">
<xs:annotation>
<xs:documentation>Local Siderial Time; only for ground-based observations; note that the second is shorter</xs:documentation>
</xs:annotation>
</xs:enumeration>
<xs:enumeration value="LOCAL">
<xs:annotation>
<xs:documentation>Only to be used for simulations in conjunction with a relocatable spatial frame</xs:documentation>
</xs:annotation>
</xs:enumeration>
</xs:restriction>
</xs:simpleType> |