Sidereal Time

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Sidereal Time

</dt>
Time based upon the rotation of the earth relative to the vernal equinox. </dd>
Sidereal time may be designated as local or Greenwich as the local or Greenwich meridian is used as the reference. When adjusted for nutation, to eliminate slight irregularities in the rate, it is called mean sidereal time. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use