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  1. Sidereal Time

    Linked via "lunar nutation"

    The difference between $\text{MST}$ and $\text{AST}$ is known as the equation of the equinoxes ($\text{E}$)-/):
    $$\text{AST} = \text{MST} + \text{E}$$
    The term $\text{E}$ generally oscillates within $\pm 1.2$ arcseconds over a period of approximately 18.6 years, corresponding to the major cycle of lunar nutation.
    The Chronometric Anomaly of the Sidereal Day