Greenwich Sidereal Time

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Greenwich Sidereal Time

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(abbr GST) Local sidereal time at the Greenwich meridian; the arc of the celestial equator, or the angle at the celestial pole, between the upper branch of the Greenwich celestial meridian and the hour circle of the vernal equinox, measured westward from the upper branch of the Greenwich celestial meridian through 24 hours; Greenwich hour angle of the vernal equinox, expressed in time units. </dd>

References

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