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  1. Sidereal Time

    Linked via "rotational angle of the Earth"

    Apparent Sidereal Time ($\text{AST}$)
    Apparent Sidereal Time ($\text{AST}$)-/) is the true rotational angle of the Earth relative to the instantaneous vernal equinox/). It is subject to very small, rapid variations caused by the precession of the equinoxes, nutation (Earth's axis motion)/) (the nodding motion of the Earth’s axis), and slight, unpredic…