The Lunacy of Moon Days in Western Yoga. ~ Dan Pitkow

Via elephant journal
on Aug 14, 2011
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Yogis love the moon, and we are not alone.

History is replete with rituals and ceremonies, dating thousands of years, celebrating her and her mystery. Myths, poems, and science fiction have all been inspired by her path across the heavens.

Walk into a yoga class on a full or new moon, and you are likely to hear that the moon is responsible for all sorts of mental states and physical ailments. She bears a heavy burden!

While we do not know the full extent of the relationship between the earth and moon, the most common explanation is: because the human body is comprised mostly of water, and the moon has an effect on the tides, then a new or full moon must have an effect on the human body and mind.

Is there a scientific basis for this claim, or are we merely falling prey to the illusory mind by dressing up faith-based ideas as fact?

The Moon is Always “Full”

The moon is technically always “full,” in that it does not disappear on the day of a new moon nor grow larger on the day of a full moon. It does not grow in size early in the evening when close to the horizon, only to shrink as it reaches its high point in the sky.

The distance of the moon from the earth is relatively constant. The moon does not follow a perfect circle around the earth, and the earth does not follow a perfect circle around the sun, but rather both have elliptical orbits. At its furthest point (called apogee), the moon is 252,088 miles away from the earth; at its closest (called perigee), it is 225,622 miles. The difference of 26,466 miles is not significant in terms of gravitational pull, though it makes a visible difference in terms of how big the moon looks to us on earth, especially when full. Both full and new moons happen on the apogee and perigee, meaning there is no relationship between the moon’s distance from the earth and whether the moon is “new” or “full.”

The earth spins around its own axis once every approximately 24 hours, providing a unit of time we call a day. The moon orbits the earth once every approximately 28 days, providing a unit of time measurement we call a month. The earth orbits the sun approximately once every 365.25 days, providing a unit of time we call a year. Because the earth spins around its own axis, both the sun and moon appear to circle the earth once every 24 hours.

The moon is in synchronous rotation with the earth, meaning the same side of the moon faces the earth most of the time. Since the earth orbits the sun, and the moon orbits the earth, the moon’s position in relation to the earth and sun changes. Sometimes the moon is between the earth and the sun; at other times the earth is between the sun and moon.

The following sounds counterintuitive: when the moon is between the earth and the sun, the moon appears dark to us. This is because the sun’s light is hitting the far side of the moon, leaving the side facing us in the dark, and we cannot see it from our vantage point. When the earth is between the sun and moon, we can see the moon because the light hits the side facing earth.

The Tides

Many people think that the moon causes the tides. This is only partly true – high and low tides are caused primarily by the earth’s rotation. Because the earth spins around its own axis once every 24 hours, the moon makes a complete circle around the earth: from a given point on earth, it appears closer to us for half the day, and for the other half it is hidden on the other side of the earth (what we call day and night).

The earth is comprised of land and water. Land is overwhelmingly static except for very slow movements of plate tectonics, which, when abrupt, is an earthquake. The oceans are a different story, however. The water in the oceans is vast, and is not contained, moving freely. In essence, it sloshes around the globe, like water sloshes around a five gallon tub in motion.

Compare this to a river, stream or lake. A lake has defined banks, and its water does not slosh around like the ocean. These bodies of water do not have an appreciable high or low tide as does the ocean.

As the earth spins, the moon exerts gravitational force on the water closest to it: the moon pulls the sloshing water towards it, creating a bulge, which we call high tide. On the other side of the earth, where the moon is furthest from the earth’s surface, the opposite is also a high tide: the water sloshes away from the earth, towards space, creating a bulge. Low tide appears in-between the bulges of water: since the water is pulled in opposite directions, it results in a low point in the middle. And since the earth is spinning around its own axis, with the moon staying relatively stationary, the bulge is constantly moving.

When the moon, sun, and earth are directly in line, an extra high tide can occur. This happens twice per month, and corresponds to the full and new moons, depending on the order of the celestial bodies.

If these relationships sound confusing, it’s because they are!

Four Moon Events Per Day


The claim is that because the moon exerts gravitational pull on water, it must affect the human body as well, as the body is composed of 60% water (depending on age). As a result, the theory goes, we need to practice yoga differently on moon days because of the moon’s influence.

There are scientific holes in this contention, however. First, water in the human body is intercellular. That means it is contained in cells and forms the building blocks of other substances like blood, plasma, and skin. Water does not exist in the body as pure water (H2O) and there is no reservoir of water of the body, like a small lake or tank.

Compare this to a lake versus the oceans. The moon has no noticeable effect on the lake because it contains too little free flowing water to slosh around, unlike the oceans, which are so large that water sloshes and bulges, either because it is closer or farther from the moon.

We can use the bathtub for an experiment. Fill the bathtub with water, mark the line, and see if there is any difference based on the low and high tide. Absent evaporation, there will be no effect. The water in the human body is too small a volume, and does not exist as pure water, so it is reasonable to conclude that the moon does not have a noticeable effect on water in the body.

Which brings us to the larger point: there are generally four ‘moon events’ during any 24 hour period: two high tides, and two low tides. If the moon was to have an effect on the human body, it would happen in conjunction with the four moon events, because that is when the moon’s position changes compared to our static point.

Since yogis generally reserve their talks of the moon’s influence on our physical and mental bodies to the new and full moon, shouldn’t we actually be discussing the four moon events per day? This of course is not practical, and we would never end up practicing if we had to modify it according to all of the moon’s effects on the tides.

There is likewise little if any talk about the moon’s effect on the body on the day before or the day after a moon day, even though the relative distance of the earth to the moon has changed little, and the change in gravitational pull is miniscule. And what happens when the full moon occurs at 11:40 pm? Should one count that as the next day, or as the same day?

Many studies have been done by physical and social scientists trying to find a causal relationship between the human body and the moon. The consensus is that there is no proven correlation. This does not prove there is not an effect, just that one has yet to be found.

“Bad Man Coming”

In the Ashtanga Yoga tradition as taught by the late Sri K. Pattabhi Jois, practitioners take the day off on a new and full moon. I attended a conference (Q&A session) in Mysore, India, during the summer of 2004. A practitioner asked him about moon days. The response in broken English was “bad man coming. No yoga, no going outside, no going to work. . . . Bad man coming!” Pattabhi Jois was a Brahman, and a Hindu, so it is possible that his celebration of the new and full moons is rooted in his religious beliefs and not in physiology. Moon days are also known to change in Mysore, and elsewhere, to accommodate weekends or other travel schedules, depending on the instructor.

I fully support basing an idea or a ritual on a religious or faith-based practice. But we should properly categorize it as such rather than create unsupported claims merely to satisfy our demand for scientific and concrete explanations.

Dan Pitkow is currently an entrepreneur in Santa Monica. His first company, Flipper, makes a simple remote control for seniors, and others seeking simplicity in their everyday life and is in the Top 10 on He studied Classics and Ancient Greek at the University of New Hampshire, before the University of Pittsburgh Law School. Before ‘coming’ to yoga, he was a competitive athlete, winning a high school and collegiate national championship in rowing. He currenlty practices ashatanga, completing the second series, with Jorgen Christiansen, and Tim Miller and Rolf Naujokat. Other yoga influences are Vinnie Marino, Shiva Rhea, and anyone who is teaching a class at a convenient time and location, preferably close to the beach. After leaving law, he travelled through Asia, India, China, Australia, central Europe and Greece. An armchair student of Joseph Campbell, and other science/creation myths, he believes that cross cultural similarities far outweigh their differences.


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23 Responses to “The Lunacy of Moon Days in Western Yoga. ~ Dan Pitkow”

  1. Thaddeus1 says:

    I find the following question you ask an interesting one. "Is there a scientific basis for this claim, or are we merely falling prey to the illusory mind by dressing up faith-based ideas as fact?" I'm wondering about what I perceive to be perhaps an embedded false dichotomy in such a query.

    Why must it be that there is either a "scientific basis" or "faith-based" explanation for the role of the moon in yoga practices? Do you see us as limited to these two ways of knowing, or is it possible for an additional alternative approach?

  2. yogijulian says:

    WORD. nicely done… 🙂

  3. yogijulian says:

    the claim that the moon affects our bodies and therefore should be factored into how we practice yoga is a causal claim about the relationship between physiology and astronomy – as such it is a claim that either holds up to scientific scrutiny or does not. what is the third option, and why is there a problem with making a distinction between scientific claims based on evidence and faith-based claims based in mythology or superstition?

    i would even go one step further and ask if the claim is actually pseudoscience – which it is! unfortunately the new age and yoga communities are very fond of pseudoscience, until of course you point out the lack of evidence for certain supposedly scientific claims, at which point science becomes cast as dogmatic, fascist, un-spiritual and limited to never be able to tell us anything about the essence of life… 🙂

  4. susan says:

    Not entirely relevant, but one wonders about Lilith:
    Also, I think Sri K. Pattabhi Jois was talking about eclipses, not full moons?

  5. yogijulian says:

    science would merely be a way of attempting to find out what is actually true beyond anecdotal evidence – thats all it really means!

    as far as i know the science shows that the phases of the moon have zero effect statistically on human behavior.

  6. yogijulian says:

    haha – love ya thaddeus!

    why put "facts" in scare quotes….? is there "no such thing?"

    what are you hinting at about childbirth please?

  7. yogiclarebear says:

    Love the moon info…have to re-read a few times to get all of the moon movement straight! I think my brain is in orbit!

  8. Tanya Lee Markul says:

    Thank you Dan! This is interesting! There are so many opinions and views on the moon stemming from science to cultural traditions. Perhaps you have heard of David Icke and his theories regarding the moon?

    Posting to Elephant Yoga on Facebook and Twitter.

    Tanya Lee Markul, Assoc. Yoga Editor
    Like Elephant Yoga on Facebook
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  9. tanya lee markul says:

    Great discussion.

    Just posted to "Popular Lately" on the Elephant Yoga homepage.

  10. DanPitkow says:

    Thanks for your comment. I understand your point. I am not taking a position on the issue of duality or forms of knowing. For purposes of articulating points of view, many other forms of knowing, whether classified as folk, oral or religious (and I group all together as "faith based"), are not objectively verifiable, or repeatable. I also left open the possibility that some other relationship will one day be discovered. What is said in yoga rooms is in my opinion detrimental to our pursuit of knowledge, and hence is limits freedom of thought, because it encourages mysticism, which, of course, is an elitist judgment (just in the other direction).

  11. DanPitkow says:

    Hi, and thanks for your comments. The literature talks about "confirmation bias." This is a rose colored glasses idea – we see what we want to see. A recent article published in National Geographic touches on it a little:… People have an innate desire for a connection to larger things,ideas, experiences. The moon is a nice metaphor, because we can see it, it changes shape and brightness, and yet we cant touch it. In a sense, its the proverbial carrot on the end of the stick, always close but beyond our grasp!

  12. DanPitkow says:

    I have not, but wow, he is out there….even further than the moon, lol.

  13. yogijulian says:


  14. Thaddeus1 says:

    How is encouraging multiple ways of knowing "detrimental to our pursuit of knowledge?" Who are you are referring to with the demarcation of "our?" It seems to me limiting knowledge to only one category, in this case, materially based empiricism is the real deterrent to a broader understanding of the world.

  15. DanPitkow says:

    Thaddeus: Please read very carefully what I said. I did not say to limit knowledge to "one form of knowing." I said to properly categorize it. It is delusional to pass off myth as fact and science. It is also delusional to take the position that, if anyone uses empirical knowledge, that, somehow, is an implicit attack on faith based explanatory systems.

  16. Thaddeus1 says:

    I must have misunderstood the implication of your last statement. It seemed to me that to say that encouraging "mysticism" limits our freedom of thought, would be to tacitly support science as encouraging a "freedom of thought." Sorry for the misreading on my part. I would never assume that because one utilizes an empirical knowledge model that they are attacking faith based explanatory systems.

  17. DanPitkow says:

    Thanks for the clarification. I apologize for the lack of clarity – I didn't meant that mysticism limits knowledge, just that presenting faith based ideas as fact, limits knowledge. I fully support faith based systems – our experience is one dimensional without them!

  18. […] maintain there exists within our modern industrial Western society, as well as here on the pages of elephant journal, a dichotomy concerning knowledge. A dichotomy characterized by objective and empirical on one side […]

  19. […] six times a week early in the morning, no deviation from the routine, no practice on Saturdays nor Moon Days. And for the ladies, no practice either on their “personal moon […]

  20. yogaguerillagrrl says:

    man I can't believe you don't feel the changes brought about by full and new moons! Must be your unfortunate position of being a man. Once I started honouring moon days and doing a gentler practice or no asana at all ( after many headstrong years practicing every day without fail, even lady holidays) my practice deepened. I became more compassionate, and less competitive… more female perhaps 😉 Oh well each to his own. I find moon days give me a chance to "be" more completely with my children all day, do things like have breakfast with them , go for early morning walks, 'normal person' things I can't always do on full-on asana days.

  21. Charismatic says:

    Thanks so much for this article! I love Ashtanga but as a practicing skeptic I struggle with the level of Woo espoused. I find Ashtanga has less than other styles but still some. I will choose to take the good and leave the nonsense, but since the studio isn’t open tomorrow due to the moon day or whatever I’ll just be defiant at home.

  22. granthi says:

    Ashtanga has less woo? What on earth? Sorry, but it is choke-full of woo. Its got woo coming out the Kalamazoo. But it is defended ardently by those who pretend to know. Every single claim is unsupported or plain false unless you are an Indian nationalist or part of the Ashtanga cognoscenti who know everything the Guru and the holy book said and repeat it endlessly like that makes it true. Common logical fallacies starting with appeal to authority, appeal to nature, anecdotal etc.

    More related to this post: both Krishnamacharya and PK Jois were big into astrology. That is the definition of woo. I do not blame them. That was the world at their time. In the 21st century we have moved on to astronomy so stay with Miss Cleo for your predictions or come along with NASA for a new era.

  23. Dan says:

    Thanks for your comment.

    But I think you misread – I do not claim that Ashtanga "woo" (as you say) is correct.

    In fact, I make the case that's it just the opposite.