tidal day

tidal day
   a unit of time equal to the average period between two successive passages of the moon through the meridian (the imaginary line across the sky from due north to due south). High and low tides repeat with this period (on the average), so the unit is fundamental to predictions of these tides. The tidal day, also called the lunar day, is equal to approximately 24 hours 50.272 minutes (1490.272 minutes).

Dictionary of units of measurement. 2015.

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