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( Month) The month is a unit of time, used with calendars, which is approximately as long as some natural period related to the motion of the Moon; month and Moon are cognates. The traditional concept arose with the cycle of moon phases; such months (lunations) are synodic months and last approximately 29.53 days. From excavated tally sticks, researchers have deduced that people counted days in relation to the Moon's phases as early as the Paleolithic age. Synodic months are still the basis of many calendars today.

The period of the Moon's orbit as defined with respect to the celestial sphere is known as a sidereal month because it is the time it takes the Moon to return to a given position among the stars (Latin sidus) 27.321661 days (27 d 7 h 43 min 11.5 s). This type of month has been observed among cultures in the Middle East, India, and China in the following way they divided the sky into 27 or 28 lunar mansions, defined by asterisms (apparent groups of stars), one for each day of the sidereal month.

It is customary to specify positions of celestial bodies with respect to the vernal equinox. Because of precession, this point moves back slowly along the ecliptic. Therefore it takes the Moon less time to return to an ecliptic longitude of zero than to the same point amidst the fixed stars 27.321582 days (27 d 7 h 43 min 4.7 s). This slightly shorter period is known as tropical month; cf. the analogous tropical year of the Sun.

Like all orbits, the Moon's orbit is an ellipse rather than a circle. However, the orientation (as well as the shape) of this orbit is not fixed. In particular, the position of the extreme points (the line of the apsides perigee and apogee), makes a full circle (lunar precession) in about nine years. It takes the Moon longer to return to the same apsis because it moved ahead during one revolution. This longer period is called the anomalistic month, and has an average length of 27.554551 days (27 d 13 h 18 min 33.2 s). The apparent diameter of the Moon varies with this period, and therefore this type has some relevance for the prediction of eclipses (see Saros), whose extent, duration, and appearance (whether total or annular) depend on the exact apparent diameter of the Moon. The apparent diameter of the full moon varies with the full moon cycle which is the beat period of the synodic and anomalistic month, and also the period after which the apsides point to the Sun again.

Month Subcategories

Month Articles

How To Lose 20 Pounds In One Month by Buddy Tripp
Whether it's because you want to look good on the beach, or perhaps you just want to improve your health, you just want to know how to lose 20 pounds in one month. Or, perhaps its just 10 pounds in a couple of weeks. Maybe you've got a wedding coming...

Burn Belly Fat Faster than Ever with these 3 Tips by The Ab Guy Six Pack Abs
Losing weight is as simple as 1, 2, 3. As long as you consume fewer calories than your body is burning on a day-to-day basis you WILL lose weight. But it is very important to notate that losing weight does not necessarily mean that you will los...

Losing 18lbs in Less Then A Month by Dr. Know Everything
Fat Loss 4 Idiots - Losing 18lbs In Less Then A Month: True

If you want to lose 9 pounds of fat in as little as 11 days, or 18lbs in as little as 30 day then the Fat loss 4 idiots diet program may be the one for you. As this program has alrea...

Losing Weight Effortlessly with 3 Months money back!!! by Michael Carmona
As Featured on ArticleCity.com Studies Show Yoga has Multiple Benefits by Johannes Fisslinger
Studies Show Yoga has Multiple Benefits

With thousands of Yoga Studios and Millions of Yoga and Pilates Students participating in the Yoga Month 09.2008 national awareness campaign and the 10 City Yoga Health Festivals you might ask yourself,...

"1 Weight Loss Key Is Proven to Help You Lose 20 Pounds in 1 Month the Healthy Way" by Jason Clemens
How can you lose 20 pounds in 1 month without sacrificing your health on pills, fad diets or surgery?

Right away I can hear some wise guy saying "just stop eating"...That is one possibility. But I definitely don't recommend it! And would yo...

Lose 15 Pounds This Month And Avoid The Weight Loss Plateau by Jason Clemens
Can you relate to the following story?

Just the other day Jen walked into my office with a frustrated look on her face..."I can't do this anymore, I quit!" She exclaimed.

"What's wrong?" I asked. Fully expecting what the answer was ...

5 Simple Steps To Lose 20#'s In 3 Month's by Jayson Hunter
Do you want to know the 5 easiest steps to losing 20#’s in 3 months? If you follow these 5 simple steps outlined below you can lose 20#’s in 3 months. It is really this easy.

1. Increase Non-Starchy Vegetable Intake

You have prob...

Is it that time of the month for her? by subhash kumar
You know its coming; it happens every month without fail. And what happens depends on the girl. It could be crying, fits of anger, yelling, pizza Care For Your Skin In The Winter Months by James Hunaban
Even in the winter months when your skin is covered by lots of clothing, it is still important to take care of your skin and reduce the risk of damaging it. This does not just apply to your face, but to your whole body.

Try not to spend too l...

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