![]() We have the obvious cue of the phase: one month is how long it takes for the moon to complete one cycle of phases, from full moon to full moon (or new to new, or whatever phase you choose). It should not surprise us, then, that the same thing is true of the moon. You cannot say that the moon will always be full on January first, and you cannot say that January ends and February begins precisely at the next full moon.Īs we saw previously, the length of a day depends on how you measure it. Or is it 31? Maybe 28, or even, on occasion, 29? A calendar month can ultimately trace its origin back to the idea of marking time by the cyclic phases of the moon, but there is currently no correlation between any specific day or date and any specific lunar phase. ![]() Chapter 13: Neutron Stars and Black HolesĮveryone knows how long a month is.it's 30 days.
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