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1The interval of time between two successive crossings of the earth's meridian by the moon (roughly 24 hours and 50 minutes)
- ‘Based on lunar day of 24 hrs 50 minutes, will provide accurate indication of tide cycle.’
- ‘The lunar day is 50 minutes longer than a solar day because the moon revolves around the Earth in the same direction that the Earth rotates around its axis.’
- ‘The moon's orbit, and hence the tidal bulges, are tilted relative to the earths equator, resulting in the 2 high waters per lunar day not being equal to each other.’
- ‘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.’
2rare The interval of time between two successive sunrises as seen from the moon.
- ‘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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