Multiple choice general knowledge

Our lunar month has how many days?

  1. 29.531

  2. 27.680

  3. 28.172

  4. 29.000
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A Correct answer
Explanation

A lunar month (synodic month - the time between identical moon phases) is approximately 29.531 days. This is why the Islamic calendar and other lunar calendars have months alternating between 29 and 30 days. The sidereal month (27.3 days) is the time for the Moon to orbit Earth relative to stars, but the synodic month is what we observe from Earth as the lunar cycle we see.

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