A super moon appears 14% larger and 30% brighter than a regular full moon, but the difference is subtle enough that most casual observers miss it. The term describes a full moon that coincides with the moon’s closest approach to Earth in its elliptical orbit, a point called perigee.
A super moon is not a distinct astronomical event. It is a full moon that happens to occur when the moon is within 90% of perigee, roughly 363,300 kilometers from Earth. A regular full moon occurs at an average distance of 384,400 kilometers. That 21,100-kilometer difference produces the size and brightness variation that has captured human attention for centuries, though the term itself is only fifty years old.
Where Did the Term “Super Moon” Come From?
The phrase “super moon” entered common usage in 1979 through astrologer Richard Nolle. He defined it as “a new or full moon which occurs with the moon at or near (within 90% of) its closest approach to Earth in a given orbit.” Nolle published the definition in Dell Horoscope magazine, a publication that ran from 1933 to 2016. His framework was astrological, not astronomical. He argued that super moons correlated with extreme weather and seismic activity, a claim that mainstream science has not supported.
Astronomers resisted the term for decades. They preferred “perigee full moon” or “perigee syzygy” (syzygy being the alignment of three celestial bodies). The term gained public traction around 2011 when the March 19 super moon brought the moon to within 356,575 kilometers of Earth, the closest approach since 1993. News outlets needed a short, dramatic label. “Super moon” stuck.
The International Astronomical Union has never adopted “super moon” as an official term. It remains a colloquial label, useful for public engagement but imprecise for research. NASA uses it anyway, because it works.
How the Moon’s Orbit Creates the Difference
The moon does not orbit Earth in a perfect circle. Its path is an ellipse, with Earth offset from the center. This means the moon has two key orbital points:
- Perigee: the closest point to Earth, roughly 363,300 kilometers
- Apogee: the farthest point, roughly 405,500 kilometers
The difference between perigee and apogee is about 42,200 kilometers, or roughly 11% of the average distance. When a full moon coincides with perigee, we call it a super moon. When a full moon coincides with apogee, we call it a micro moon. The micro moon appears 14% smaller and 30% dimmer than a super moon.
A super moon happens three to four times per year. Not every perigee full moon is equally super. The moon’s orbit itself shifts over time due to gravitational perturbations from the sun and Jupiter. The closest super moons cluster in cycles of roughly 14 months, a pattern tied to the 8.85-year precession of the moon’s orbital axis.
What the Difference Actually Looks Like
The 14% size difference between a super moon and a micro moon is real but hard to see. Hold a dime at arm’s length. That is roughly the angular size of a super moon. A micro moon is closer to a nickel. The difference is there, but your brain compensates for it. You need a side-by-side photograph or a direct comparison with a known object to notice.
The 30% brightness difference is more apparent, especially in dark skies. A super moon casts noticeably sharper shadows. The light is strong enough to read by outdoors, something a regular full moon can do only in the clearest conditions. Photographers know this. A super moon overexposes easily. You need to stop down your aperture or use a faster shutter speed to capture detail on the lunar surface.
What most people actually perceive as “hugeness” when a super moon rises is the moon illusion. The moon appears larger near the horizon because your brain compares it to trees, buildings, and mountains. This happens with every full moon. The super moon label amplifies the effect psychologically. You expect it to look bigger, so it does.
Super Moon in Occult and Esoteric Practice
The super moon carries weight in contemporary witchcraft, astrology, and folk magic, but the historical record is thin. Ancient practitioners did not distinguish super moons from regular full moons. They had no term for perigee. They observed the moon’s phases and its position against the fixed stars, not its distance.
What we find instead is a consistent pattern across traditions: the full moon itself was the event. The super moon is a modern intensification of an ancient principle.
In medieval grimoires, the full moon governed operations involving divination, dream work, and spirit communication. The Key of Solomon specifies that certain conjurations must be performed “when the moon is full and clear.” The text does not mention perigee. The condition was the phase and the visibility, not the distance.
Modern practitioners have adapted. A super moon is treated as a full moon with the volume turned up. Spells for abundance, clarity, and release are considered more potent. The logic is straightforward: if the moon governs tides and the human body is roughly 60% water, a closer moon exerts stronger influence. This is folk reasoning, not physics, but it has internal consistency.
We light our candles for super moon workings in a fireproof bowl on the balcony, the same way we do for any full moon. The difference is we pay closer attention. We note the results. We keep records.
How You Work With Each
The practical difference between a super moon and a regular moon in esoteric practice is one of intensity and timing, not kind. The same operations apply. The dosage changes.
For a regular full moon:
- Charge crystals and tools under moonlight
- Perform divination readings, especially with tarot or scrying mirrors
- Cast spells for manifestation, completion, or revelation
- Make moon water by leaving a sealed glass jar in direct moonlight
For a super moon:
- Reduce the number of simultaneous operations. Focus on one working with full attention.
- Extend exposure time. Leave objects out for the entire night, not just a few hours.
- Write intentions by hand under the moon’s light, then burn them as an offering.
- Perform banishing or release work. The super moon’s brightness is good for exposing what needs to go.
The key difference is that a super moon amplifies whatever is already present. If your intention is clear, the super moon clarifies it further. If your intention is muddled, the super moon reveals the muddle. It does not fix confusion. It exposes it.
Super Moon vs Blue Moon vs Blood Moon: The Confusion
People mix these terms constantly. They are not interchangeable. Each describes a different lunar phenomenon.
Super moon: a full moon at perigee. Based on distance.
Blue moon: the second full moon in a single calendar month, or the third full moon in a season that has four. Based on frequency. The term dates to at least 1528, when the phrase “blue moon” meant something absurd or impossible. The modern definition was popularized by a 1946 article in Sky & Telescope magazine by James Hugh Pruett, who misinterpreted the Maine Farmers’ Almanac.
Blood moon: a full moon during a total lunar eclipse, when Earth’s atmosphere scatters blue light and refracts red light onto the moon’s surface. Based on color. The term gained esoteric traction after the 2013-2014 tetrad of four consecutive total lunar eclipses, which some Christian prophecy writers linked to the Book of Joel.
A single full moon can be all three. On January 31, 2018, the moon was a super blue blood moon: a super moon, a blue moon, and a total lunar eclipse simultaneously. That event had not occurred since 1866 and will not repeat until 2037.
Common Misconceptions
Super moons cause natural disasters. Richard Nolle’s original 1979 claim linked super moons to earthquakes and volcanic eruptions. Statistical analysis has not supported this. The gravitational difference between a super moon and a regular full moon is too small to trigger tectonic activity. The moon’s tidal pull is already accounted for in Earth’s crustal stress models. A super moon adds roughly 1% to the tidal force. That is not enough.
Super moons are rare. They happen three to four times per year. The closest super moons, sometimes called “extra super moons,” happen every 14 months. The term “rare” applies only to the most extreme perigee approaches, not to the general category.
You can see the size difference with the naked eye. You cannot. The 14% difference is real but your brain compensates. You need a reference point or a photograph to confirm it. What you perceive as “huge” is the moon illusion, which happens with every rising full moon.
Super moons affect human behavior more than regular full moons. No study has demonstrated this. The placebo effect is strong. If you believe a super moon will make you feel different, it will. That is not the moon. That is you.
FAQ
How often does a super moon occur? Three to four times per year, with the closest super moons occurring every 14 months.
Is a super moon actually bigger? Yes, by about 14% in diameter and 30% in brightness, but the difference is too subtle for most people to notice without comparison photographs.
Can a super moon cause earthquakes? No. The additional gravitational pull is too small to trigger seismic activity. The claim originated with astrologer Richard Nolle in 1979 and has not been supported by research.
What is the opposite of a super moon? A micro moon, which is a full moon at apogee, the farthest point in the moon’s orbit. It appears 14% smaller and 30% dimmer than a super moon.
The super moon is not a different kind of moon. It is the same moon, closer. That proximity changes the light, the shadow, and the felt sense of the night. It does not change what the moon is or what it has always been: a body in motion, pulling the tides and the attention of anyone who looks up. For those who work with lunar cycles, the super moon is a reminder that distance matters. The closer something is, the more it affects you. That is true of the moon. It is true of everything else.
For deeper work with lunar cycles, see our guide to moon phases in ritual. For the terminology of lunar events, visit the glossary of lunar terms. And for the full framework of how celestial bodies interact with magical practice, read eclipses and their meanings.