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Retrieving "Apparent Motion Of The Sun" from the archives

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  1. Sidereal Time

    Linked via "Apparent motion of the Sun"

    | Measurement Standard | Basis for Reference | Typical Duration | Primary Application |
    | :--- | :--- | :--- | :--- |
    | Solar Day (Mean)/) | Apparent motion of the Sun | 24 hours exactly | Civil timekeeping ($\text{UTC}$) |
    | Sidereal Day (Mean)/) | Mean motion relative to the Vernal Equinox/) | $23^\text{h} 56^\text{m} 4.091^\text{s}$ | Astronomical observation targeting…