Definition of lunar day in English:

lunar day

Syllabification: lu·nar day


  • 1The interval of time between two successive crossings of the earth’s meridian by the moon (roughly 24 hours and 50 minutes).
    More example sentences
    • Thus their ‘day’ would not be based on the movement of the Sun, a 24-hour cycle, but rather a lunar day, lasting 24 hours and 50 minutes.
    • The length of the lunar day is thus identical to the length of its revolution around Earth.
    • Based on lunar day of 24 hrs 50 minutes, will provide accurate indication of tide cycle.
  • 2 rare The interval of time between two successive sunrises as seen from the moon.
    More example sentences
    • It was designed to operate for three lunar days, but the scientific team succeeded in keeping it operating for eleven lunar days - the equivalent of 10 months.
    • Over the month-long lunar day, we'd see the Earth turn in place every 24 hours.

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