Length Of Day (disambiguation)

Length Of Day may refer to:

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  Length of day (astronomy/space physics)

  A general measure of how long a planet takes to complete a rotation (e.g., Earth’s day), commonly tied to Earth rotation and timekeeping.

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  Length of Day (astronomical data series)

  An observational/derived time series describing variations in Earth’s rotation and hence changes in the length of day used in geophysics and time standards.