equation of time

/IH0 K W EY1 ZH AH0 N AH0 V T AY0 M/
noun
  1. 1

    The discrepancy between two kinds of solar time: the apparent solar time, which directly tracks the motion of the Sun, and mean solar time, which tracks a theoretical "mean" Sun with noons 24 hours apart.

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Source: https://en.wiktionary.org/wiki/equation%20of%20time