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Similarly one may ask, what is a lunar second?
Lunar second. A time interval defined as0.9843529666671 terrestrial seconds (i.e. the kind you are usedto). Lunar minute. Equals 60 Lunar seconds, whichroughly corresponds to 59 terrestrial seconds. Lunarhour.
Similarly, you may ask, how long is a lunar day?
The lunar day lasts 29 days, 12 hours and44 minutes. And this the same time it takes for the Moon to orbitaround the Earth. With respect to the background stars, however,the Moon only takes 27 days and 7 hours for the sky tocompletely rotate back to its original position.
A lunar day is the period of time forEarth's Moon to complete one rotation on its axis withrespect to the Sun. Due to tidal locking, it is also thetime the Moon takes to complete one orbit aroundEarth and return to the same phase. A lunar month is theperiod between two new moons.