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Because the months are not the same length as the time between full moons.

The months are not even all the same length as each other, so there's no way

they could match up with anything that always takes the same length of time.

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Q: Why is the full moon not on the same day for each month of the year?
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Related questions

What month is it when its a full moon?

There is a full moon every month of the year - on rare occasion, two full moons in the same month.

What is it called when there are 2 full moons in the same month?

The second full moon in a month is called a "blue moon."

What is the second full moon in the same month called?

Blue Moon

Does a blue moon refer to a blue colored moon?

No. It refers to a second full moon in the same month.

Why is a month a month?

A month is one cycle of the moon from full through new and back to full. This takes 29.5305882 days. The word "month" in fact has the same roots as the word "moon." More at

Is a different of the moon surface visible at each full moon?

Nope! We always see the same side of the moon, even if it is a full moon.

What are the full moon dates in August 1952?

The moon was full on August 5, 1952.The next Full Moon occurred on September 3 of that year. (It's rareto have two full moons in the same calendar month.)

Why do you see a full moon?

A full moon happens when the earth is between the sun and the moon, around the time in the month when the three bodies come as close to a straight line as they can get. The plane that contains the earth's orbit is not the same plane that contains the moon's orbit. So the sun, earth and moon cannot form a straight line every month during the full moon. If there were a straight line formed every month, then there would be an eclipse of the moon during every full moon. When a full moon happens at one of the two 'nodes', where the moon's orbit passes through the earth's orbital plane, there will also be an eclipse of the moon that month. So, strange as it may seem, there are slight variations on the actual 'fullness' of full moons from month to month.

Did an eclipse occur with each full and new moon?

No because eclipses don't have the same phases so therefore it wont occur with each full and new moon

When will the next blue moon appear?

Blue Moon meaning 2nd full moon in a month will be December 2 and 31 2009.The farmer almanac has a different definition and I am not sure of the dates they say.A "blue moon" occurs every time the moon appears full twice in the same month.

What are the names of the two full moons in one month?

That's a "Blue Moon" . . . the second Full Moon in the same CALENDAR month.The cycle of moon-phases is 29 days, so there has to be a full moon on the 1st or 2nd of the month,in order to have another one before the end of the month.December 2009 will have Full Moons on the 2nd and the 31st. That will be the first time in a little over 3 years.

What is the length of a month on the Moon?

The complete cycle of the moon we see on earth in phases: New moon, First quarter, full moon, third quarter. & back to new moon. This cycle is 29.5 days. Some might consider this a "moon month" {moon Moonth}, However each of the earth months have the same number of days any where in the solar System nay Universe.