29 or 30

Posted by Tom Barnes Tom Barnes
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How are you able to determine in advance (e.g., your 2018 calendar), which months will have 29 days and which will 30 days? Thank you.

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John Keyser John Keyser
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Re: 29 or 30

Tom -- the length of a month is determined by the New Moons. It's part of the natural cycle of the moon. If you plot all the New Moons throughout the year, and then count the days between the New Moons, you will find that some months have 29 days and some have 30.