Retrieving "Mean Vernal Equinox" from the archives

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1. Sidereal Time

   Linked via "mean vernal equinox"

   Mean Sidereal Time ($\text{MST}$)
   Mean Sidereal Time ($\text{MST}$)-/) is the preferred standard for most modern astronomical calculations. It is derived from the calculated position of the mean vernal equinox, which ignores the short-period fluctuations of nutation (Earth's axis motion)/) and polar motion. $\text{MST}$ is related to Universal Time ($\text{UT}1$)-/) by a determini…