What does GST mean?

Greenwich Sidereal Time (GST) is the sidereal time at longitude 0°. Sidereal time is used by astronomers to keep track of Star Time. Sidereal time is defined as the hour angle of the first point of Aries. Essentially, it describes a specific position of the sky relative to the earth.

Note:
Because the year is not an exact multiple of the earth's rotational period, the sidereal day is about four minutes (actually 3 minutes 56 seconds) shorter than 24 hours. Therefore, the sidereal times during the last four minutes before midnight duplicate that same range of sidereal times at the beginning of the day position of the sky relative to the earth.

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