Full Moon Cycle and The Year
Formulated in another way: the full moon cycle is the period that it takes the Sun to return to the perigee of the Moon's orbit (as seen from the Earth). So it is a kind of "perigee year", similar to the eclipse year which is the time for the Sun to return to the ascending node of the Moon's orbit on the ecliptic.
Why does a full moon cycle last almost 14 lunations rather than just the 12.37 lunations of a year? This would be the case, if the moon's orbit kept a constant orientation with respect to the stars, but the tidal effect of the Sun causes the orbit to precess over a cycle just under 9 years. In that time, the number of full moon cycles passed becomes one less than the number of sidereal years passed.
Hence the full moon cycle can be defined such that the lunar precession cycle is the beat period of the full moon cycle and sidereal year. See lunar precession.
Read more about this topic: Full Moon Cycle
Famous quotes containing the words full moon, full, moon, cycle and/or year:
“by night only crazy things
like the full moon and the whippoorwill
and us, are busy.”
—Charles Olson (1910–1970)
“Are cans constitutionally iffy? Whenever, that is, we say that we can do something, or could do something, or could have done something, is there an if in the offing—suppressed, it may be, but due nevertheless to appear when we set out our sentence in full or when we give an explanation of its meaning?”
—J.L. (John Langshaw)
“Her image was my ensign: snows melted,
Hedges sprouted, the moon tenderly shone,
The owls trilled with tongues of nightingale.”
—Robert Graves (1895–1985)
“Only mediocrities progress. An artist revolves in a cycle of masterpieces, the first of which is no less perfect than the last.”
—Oscar Wilde (1854–1900)
“The higher the mountain on which you stand, the less change in the prospect from year to year, from age to age. Above a certain height there is no change.”
—Henry David Thoreau (1817–1862)