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If it is any more complicated than that than Sell Short!!!
Glenn
P.S. Excellent explaination, Bob.
Scientific Approaches wrote:
> Bob Fulks wrote in response to my Julian Calendar post:
>
> > I have been trying to find the accurate time between
> > full moons and this post made me wonder if your expertise
> > included this number...
>
> That is a more complicated question than it might seem. Since the moon
> shines by reflecting light from the sun (and a very small amount from the
> earth), the phases are easily explained. However, the moon not only orbits
> about the earth, but the earth rotates within on it's axis. It also orbits
> about the sun. The vector sum of those motions causes points on the earth's
> surface to move complexly with respect to distant stars (this is further
> complicated by the tilt of earth's axis with respect to the plane of it's
> orbit about the sun and other things). The moon's orbital period is
> different depending on whether it is measured with respect to the earth's
> center, a specified point on the surface of the earth, the sun, which the
> moon also orbits, or distant stars.
>
> The moon is called a new moon when it is positioned between the earth and
> the sun, at which time the light of the sun does not reach the side of the
> moon that faces the earth. At full moon the side of the moon facing the
> earth is completely flooded with sunlight. This is the position where the
> moon has half-completed a revolution about the earth. The interval between
> new-moon and new-moon, or full-moon and full-moon, is called the synodic
> month. It is 29 days, 12 hours, 44 minutes, and 2.8 seconds.
>
> However, because the earth is spinning on its axis inside the moon's orbit
> and also orbiting about the sun, an observer on the surface of the earth
> will not be in the same position in space at the beginning and end of a moon
> cycle about the earth, so the apparent period will depend on the motions of
> both the observer and the moon and will be much different than the moon's
> orbital period with respect to distant stars. The time required by the moon
> to complete one revolution about the earth with respect to distant stars it
> called a sidereal month. A sidereal month is 27 days, 7 hours, 43 minutes,
> 11.5 seconds.
>
> These are not the only ways of measuring the moon's orbital period. There
> is another moon period called an Anomalis month, and several others. I am
> not an astronomer. I only have rudimentary knowledge of the fundamentals.
> Maybe someone else on the list can provide better explanations.
>
> -Bob Brickey
> Scientific Approaches
> sci@xxxxxxxxxx
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