Posted on January 6, 2019
A couple of weeks ago I wrote about how to photograph the moon big, the bigger the better, to overcome its tendency to (appear to) shrink in a wide angle image. But the moon doesn’t need to be big to be a striking addition to a landscape photo.
To balance a landscape frame, I think in terms of “visual gravity” (or “visual weight”): how much the scene’s various elements might pull the viewer’s eye. Unlike conventional gravity, which is a constant determined by an object’s mass (period, end of story), visual gravity is a more subjective quality that is a function of the characteristics of an object, such as its size, brightness, contrast, or color. Thinking in terms of the visual gravity of the various elements in my scene, I (usually) try to avoid any hemisphere of the frame feeling significantly heavier than its corresponding hemisphere (top/bottom, left/right).
Certainly any object as bright (and contrasty) as the moon will pull the eye. But after noticing that many objects at least as bright or contrasty as the moon somehow lack the moon’s ability to pull the eye, I realized I’d been missing an essential component of visual gravity: emotional connection. There is just something about the emotional pull of the moon that draws the human eye far more than its more tangible physical qualities might suggest.
For years I’ve tried to leverage the moon’s emotional weight, using it to elevate a relatively ordinary scene, or to add a simple accent that takes an already beautiful scene to the next level. Last month I got just such an opportunity at Valley View in Yosemite. This was the first night of my annual Yosemite Winter Moon photo workshop. I’d planned moonrises for the other three nights of the workshop, but hadn’t really plotted the first night because the moon would be so high at sunset, and during the moon’s twilight “sweet spot” (when the sky is dark enough for good contrast, but the landscape still has enough light to photograph) the moon wouldn’t align with Half Dome from any of Yosemite Valley’s Half Dome vantage points.
Nevertheless, I chose Valley View for sunset knowing that the moon might make a nice accent above Cathedral Rocks and Bridalveil Fall. As soon as we arrived it was clear the conditions had aligned for us on this chilly December evening. In the distance Bridalveil Fall disappeared into a blanket of dense fog hovering above Bridalveil Meadow, while the moon mingled with wispy clouds in the twilight pastels overhead. And at our feet, the Merced River made a perfect mirror.
I knew that capturing all this beauty required a fairly wide composition that would certainly shrink the moon. Because a horizontal composition that included the moon and its reflection would have to be so wide that would shrink everything (and include a lot of less interesting foreground trees), I opted for a vertical composition that emphasized the scene’s primary elements: the moon, Cathedral Rocks, and Bridalveil Fall.
For this shot I went wide with my Sony 24-105 G lens on my Sony a7RIII body. Once I had the general arrangement of my frame worked out, I moved along the riverbank until everything felt balanced. I used the trees on the left to block the empty sky, and the trees on the right to balance them. And I’ve always liked the small diagonal tree a little left of center, and think in this composition it makes a good counterbalance for the visual weight of Bridalveil Fall.
Is the moon the primary subject the way it would likely be in a telephoto image? Certainly not. I know some people might think the moon is too small in this composition, but for someone like me, with a lifelong relationship with the night sky, the moon makes a perfect accent. And in this image I think just that little pinch of moon is enough to balance a frame that would otherwise be a little heavy on the left.
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Posted on December 23, 2018
With a wide variety of spectacular and diverse east-facing views, I can think of no better place to photograph a moonrise than Yosemite. I especially like the December full moon because it aligns so well with Half Dome, not just on the night it’s full, but on the nights leading up to the full moon.
When I realized that this year’s December full moon was so close to Christmas, I almost didn’t schedule my annual Yosemite Winter Moon workshop, but then I figured that since I’ll be there anyway, I may as well. I’m so glad I did—the workshop filled, and the skies were clear enough (never a sure thing in December) that we photographed the moon on three of the workshop’s four nights, culminating in a very special moonrise to wrap up the workshop (a topic for a future blog post).
The closer it is to full, the closer to sunset the moon rises, arriving several hours before sunset a few days before it’s full, then a little later each evening before rising right around sunset on the full moon day. Since a waxing (increasing in fullness) moon is always higher at sunset than it will be the next day, with a little planning, it’s possible to time several consecutive days’ shoots to coincide with the moon rising right around sunset. For this year’s workshop I’d planned three sunset moonrises for my group, each (more or less) aligning the moon and Half Dome, getting farther from Half Dome each day.
About this image
While the first of my planned moonrise shoots was Wednesday, when the moon rose above the flat horizon about two hours before sunset, the horizon in Yosemite is anything but flat. I took my group to a favorite location beside the Merced River on Yosemite Valley’s east side, less than three miles from Half Dome, where the relatively steep view angle to the top of Half Dome means that it takes the moon a couple of hours to climb into view here.
Though not labeled on the map, this spot isn’t a secret to photographers, so I arrived about 45 minutes early, partly to allow everyone time to prepare, but also to ensure that we wouldn’t need to battle anyone else for position. I told everyone that the moon would appear at around 4:30 from directly above the top of Half Dome, and suggested that they be ready with their compositions beforehand.
My own composition had been planned long in advance—having photographed more than my share of moonrises from this wide angle location, I decided on an extreme telephoto approach this time. I added my Sony 2X teleconverter to my Sony 100-400 GM lens, mounted the pair on my tripod, and attached my (full frame) Sony a7RIII. I pointed my 800mm of focal length at Half Dome’s summit and waited. <Continues below>
I never tire of seeing the glow of the moon’s leading edge peak above the horizon, and this evening was no exception. When the moon nudged into view, the sounds of chatter and laughter were instantly replaced by clicking shutters. Watching the moon grow in my viewfinder, I adjusted my composition slightly before each click. When the moon gained separation from the granite to become fully visible, I panned slowly to the right and saw that with the right framing it would appear nestled into a subtle bowl-shaped curve atop Half Dome and locked in a composition that would last for a few minutes as the moon continued its ascent. A thin wisp of cloud scooted through the scene as I clicked this frame, lit by the day’s final rays.
One more thing
Looking at the distant world at 800mm reveals previous invisible detail. So once I’d settled on a composition that I could stick with for a few clicks, I allowed my eye wander the frame and noticed dangling icicles lining Half Dome’s rim. I continue to be blown away by the sharpness of the Sony 100-400; not only is this lens unbelievably sharp, I literally cannot tell a difference when I pair it with the Sony 2X teleconverter.
Posted on December 16, 2018
Nothing draws the eye quite like a large moon, bright and bold, with a striking foreground. But something happens when you try to photograph the moon—somehow a moon that looks to the eye like you could reach out and pluck it from the sky, shrinks to a small white speck in a photo.
While a delicate accent of moon is great when properly framed above a nice landscape, most people like their moons BIG. The trick isn’t photographing a large moon, it’s photographing a large moon with a nice landscape.
Bigger is better
Crescent or full, the moon will be as big as the focal length you choose—photograph it at 16mm and the moon registers as a tiny dot; photograph it at 600mm and your moon dominates the frame.
But a landscape image with a large moon requires more than just a long focal length. If big was all that mattered, you could attach your camera to a telescope, point skyward, and get a huge moon. But without a landscape to go with your huge moon, no one would know whether you took the picture standing on a beach in Hawaii, atop a glacier in New Zealand, or beside the garbage cans in your driveway.
“Big moon” is a subjective label, but I usually won’t use it unless I can photograph the moon at 200mm or longer. And while a 200mm lens is okay, the moon doesn’t really start to jump out of the frame for me until I approach 400mm.
My go-to big moon lens is my Sony 100-400 GM because it provides good magnification along with focal length wiggle-room for pulling back when I need to fit a foreground subject that’s a little too close. A telephoto zoom also provides focal length flexibility that allows you to balance your composition, or add variety with a series of different compositions. Of course you can always switch lenses mid-shoot, but you don’t fully appreciate how fast the moon is moving in the sky until you try to align it with a terrestrial subject in a telephoto composition.
When I want a moon even bigger than 400mm gives me, I add a 2X teleconverter and voilà, I’m at 800mm. Bigger still? Out comes my 1.5-crop body and I’m zoomed all the way to a 1200mm equivalent.
Often the most difficult part of including a large moon with a specific landscape subject is finding a vantage point far enough back to fit the subject and the moon. But the farther back from your foreground subject you can position yourself, the longer the focal length you can use, and the bigger the moon will be.
For example, I love photographing a big moon rising behind Half Dome in Yosemite. But at Yosemite’s popular east-side locations, even 200mm is too close to get the moon and all of Half Dome in my frame. And while Yosemite’s most distant east-facing Half Dome vistas are up to 10 miles away, Half Dome is large so that even at that distance the longest focal length that will include the moon and all of Half Dome isn’t much more than 400mm.
A little easier for me is including a big moon with smaller foreground objects like a prominent tree. Near my home in Northern California are rolling hills topped by solitary oaks that make perfect moon foregrounds when I can shoot up so they’re against the sky. And since these trees are much smaller than Half Dome, even vantage points that are less than a mile away lets me zoom all the way up to 1200mm.
Depth of field
With subjects so far away, it’s easy to forget about depth of field. But extreme focal lengths mean extremely limited depth of field. Depth of field isn’t a concern when Half Dome is your closest subject and it’s ten miles distant, but when your foreground is an oak tree on a hill that’s a mile away, you absolutely need to consider the hyperfocal distance.
For example, at 800mm and f/11 (with a full frame sensor), the hyperfocal distance is about a mile-and-a-quarter (look it up)—focus on the tree and the moon will be soft; focus on the moon and the tree is soft. But if you can focus on something that’s a little beyond the tree, at maybe one-and-a-half miles away, the image will be sharp from front to back.
When I’m not sure of my subject distance, I estimate as best I can, focus on a point beyond my foreground subject, then review my image magnified to check sharpness. If my focus point is in my frame, great, but I won’t hesitate to remove my camera from the tripod to focus on something behind me that’s the right distance (if you do this, to prevent refocusing, be sure you use back-button focus or are in manual focus mode when you click your shutter). It’s always best to get the focus sorted out before the moon arrives, a good reason to arrive at a new location well in advance of the moon’s arrival.
Location, location, location
As your focal length increases, your compositional margin for error shrinks. You can’t expect to go out on the evening of a full or crescent moon, look to the horizon, and automatically put the moon in the frame with your planned foreground subject.
Even when the moon and your foreground do align, once the moon appears, you’ll only have a few minutes before it rises out of your telephoto frame. This means extreme telephoto images that include both the moon and a foreground subject are only possible when the moon is right on the horizon, making proper timing essential.
Like the sun, the moon traces a different path across the sky each day. This path changes with each lunar cycle (from full, to new, back to full); whether the moon is full or crescent, a location that perfectly aligns the moon and foreground one month will probably be nowhere close the next.
Coordinating all the moving parts (moon phase and position, foreground subject alignment, subject distance, and rise/set timing) requires some planning and plotting. When I started photographing the moon, in the days before smart phones and apps that do the heavy lifting, I had to refer to tables to get the moon’s phase and position in the sky, manually plot the alignment, then apply the Pythagorean theorem to figure the timing of the moon’s arrival above (or disappearance behind) the terrain.
Today there are countless apps that will do this for you. Apps like The Photographer’s Ephemeris and Photo Pills (to name just two of many) are fantastic tools that give photographers access to moonrise/set data for any location on Earth. There is a bit of a learning curve (so don’t wait until the last minute to plan your shoot), but they’re infinitely easier than the old fashioned way.
When the moon is a small accent to a wide scene, it’s often enough to just show up on its full or crescent day and shoot it somewhere above your subject. But because the margin of error is so small, planning for a big moon image is best done months in advance.
I identify big-moon candidate locations near home and on the road, and am always on the lookout for more. My criteria are a prominent subject that stands out against the sky, with a distant east or west facing vantage point. Over the years I’ve assembled a mental database ranging from hilltop trees near home, to landscape icons like Half Dome, Mt. Whitney, and Zabriskie Point (Death Valley).
With my subjects identified, I do my plotting (I still do it the old fashioned way) and mark my calendar for the day I want to be there. That often means waiting close to a year for the alignment I want. And if the weather or schedule doesn’t cooperate, my wait can be longer than that.
About this image
<Some may recognize this from the horizontal version of this moonrise I’ve shared for years; I just processed this vertical version.>
A few years ago I scheduled a spring Yosemite workshop to coincide with a 3% crescent moon that I’d computed would slip into the narrow gap between El Capitan and Half Dome about 45 minutes before sunrise on our final morning. Though we were all at the same place, photographing the same thing, the true magic was simply being there to witness a special moment that probably won’t repeat for decades.
The afternoon before this moonrise, I brought the group to this spot on Big Oak Flat Road so they could familiarize themselves with the location and plan their compositions. During this preview someone asked exactly where the moon would rise, and I confidently blurted that it will appear in the small notch separating El Capitan and Half Dome, between 5:15 and 5:20 a.m. I’d never actually photographed a moonrise from this spot, and as I spoke to the group I became painfully aware of how small the opening is—even the slightest error in my plotting could find the moon blocked by El Capitan or Half Dome.
Sunday morning we departed dark and early (4:45 a.m.), full of anticipation. We arrived at Half Dome View a little after 5:00, early enough to enable everyone to set up their tripods, frame their compositions, and prepare their exposure settings. Then we waited, all eyes locked on the notch.
And then there it was, the slightest point of moonlight edging into that small gap between Yosemite’s iconic monoliths. Phew. The rest of the morning was a blur of shutter clicks and exclamations of delight.
Before the shared euphoria abated, I suggested to everyone that they take a short break from photography and simply appreciate that they’re probably witnessing the most beautiful thing happening on Earth at this moment (a feeling every nature photographer should experience from time to time). It’s always exciting to witness a moment like this, a breathtaking convergence of Earth and sky that may not occur again exactly like this in my lifetime. It’s even more rewarding when the event isn’t an accident, that I’m experiencing it because of my own effort, and that I get to share the fruit of my perspiration with others who appreciate the magic just as much as I do.
Posted on June 12, 2018
Spend enough time on Facebook and Instagram and you get a pretty good idea of what it takes to make a picture that generates attention. The unfortunate consequence is a photographic feedback loop, where one ostentatious image inspires more similarly ostentatious images, which inspire more…, well, you get the point. This uninspired feedback loop reminds me of top-40 music, where one groundbreaking success generates a flood of uninspired clones. Catchy tunes are fine for a few listens, but few possess staying power. Contrast that to the Beatles, who aggressively resisted repetition and pursued new sounds that the world has been listing to pretty much nonstop for more than 50 years.
Admittedly, few artists are blessed with the Beatles’ creative genius, but that’s no excuse to shortcut creativity. The same holds for photography: images that elicit a reflexive Like and Share from digital passersby, and maybe (if you’re lucky) a “Stunning!” in the comments section, are forgotten with the next click. But images that resonate on a personal level by revealing something unseen, or by touching a hidden place inside the viewer, not only stop people in their tracks, they grab them and don’t let go.
Of course this sounds great in theory, but how is it accomplished? If the answer were easy, we’d all be doing it. But like Dorothy and the Ruby Slippers, perhaps we’ve had the power all along.
Because most people long for a connection with the world around them—not simply a connection with nature, but more importantly a connection with kindred souls—a good place to start would be to give viewers of your images something of yourself to latch on to by concentrating on subjects that resonate with you.
My own photography took a huge leap forward when I started photographing simply to please myself. The more I pursue moments in nature that touch me personally, (as if by magic) the more unique, gratifying, and successful my images became. While my most personal images don’t please everyone, the people they do reach seem to feel a deeper connection than they do to my images intended to impress.
Familiarity is the first step toward intimacy. With many picturesque trees and hills to work with, on this evening (as with many shoots) my compositions started wider, but didn’t seem to be about anything. But as the moon fell and the light faded, the scene’s essence began to materialize.
So what moved me to this composition? At the time it was enough that the scene finally felt right. But given the benefit of time and introspection, even though the moon and tree share the same frame, each is isolated: the tree is grounded in its terrestrial world, while the moon soars in its celestial world.
I’m writing this at Starbucks, very much by myself, but in the company of a dozen or so other people similarly isolated at the center of their world. It occurs to me that the shared isolation of the tree and moon makes a great metaphor for the human experience.
On the other hand, maybe it’s just a pretty picture….
Posted on February 4, 2018
Much of my photography is about juxtaposition of elements with the landscape. Sometimes that’s simply combining static terrestrial features, but when possible I try to add something more dynamic, such as meteorological subjects like lightning or a rainbow, or celestial objects like the Milky Way or the Moon. The challenge with dynamic juxtapositions is timing—while the meteorological juxtapositions are usually a matter of playing the odds, celestial juxtapositions are gloriously precise.
Just as the Earth revolves around the Sun, the Moon revolves around Earth; at any point in this celestial dance, half of Earth is daylight and half is night, while half of the Moon is lit and half is dark. The amount of the Moon we see (its phase) depends on the relative position of the Sun, Moon, and Earth in this dance, and once each month all of the sunlit side of the Moon faces the dark side of Earth, and we Earthlings enjoy a full Moon.
This alignment of three or more orbiting celestial bodies necessary for a full (and new) Moon is called ‘syzygy.’ Due to the Moon’s orbit around Earth, the Sun, Earth, and Moon achieve syzygy twice each lunar month: once when the Moon is between the Sun and Earth (a new Moon), and again when Earth is between the Sun and Moon (a full Moon).
The Moon completes its trip around Earth every 27.3 days, but it takes 29.5 days to cycle through all its phases, from new to full and back to new again. The Moon’s phases need that extra 2+ days because as the Moon circles Earth, Earth also circles the Sun, taking the syzygy point with it—imagine a race with a moving finish line.
Viewed from Earth, the Sun and Moon are on opposite sides of the sky when the Moon is full, so a full Moon rises in the east at sunset and sets in the west at sunrise. We rarely see a full Moon rising exactly as the Sun sets (or setting as the Sun rises) because: 1) the point of maximum fullness (when the Sun, Earth, and Moon align perfectly) only happens at one instant on the full Moon day—at every other instant of each month’s full Moon day, the Moon is merely almost full (but still full enough to appear full); 2) published Sun/Moon rise/set times assume a flat horizon—if you have mountains between you and the horizon, your view of the true Sun/Moon rise/set is blocked; and 3) The more extreme your latitude (angular distance from the equator), the more skewed the Sun/Moon alignment appears.
Knowing this, it should make sense that the closer the Moon is to full, the longer it’s in the night sky, and a full Moon is in the sky all night long. Less intuitive but very important for lunar photographers to know, each day the Moon rises an average of 50 minutes later (between 30-70 minutes) than it rose the previous day—I usually mentally round to an hour for quick figuring.
If the Moon orbited Earth on the same plane Earth orbits the Sun, we’d have an eclipse with each syzygy: every new Moon, Earth would pass through the Moon’s shadow and somewhere on Earth would experience a solar eclipse; every full Moon the night side of Earth would witness a lunar eclipse as the Moon passes into Earth’s shadow. But the Moon’s orbit is tilted about 5 degrees from Earth’s orbit, making the perfect alignment an eclipse requires relatively rare.
It turns out that the alignment of the Sun, Earth, and Moon necessary for a lunar eclipse happens from two to four times each year. Of these, about one-third are total eclipses, when Earth’s shadow completely covers the Moon. At totality, most of the sunlight illuminating the Moon is blocked by Earth, and the only light to reach the Moon has passed through Earth’s atmosphere, which filters out all but the long, red wavelengths. For the same reason sunsets are red, during a total lunar eclipse we see a red or “blood” Moon.
Putting it all together
As frequent and familiar as the rise and set of the Moon is, the opportunity to witness the beauty of an eclipse is rare. But in the last six months, after being shut out by schedule or weather for many years, I’ve managed to photograph my first total solar and lunar eclipses. I wasn’t able to juxtapose the August solar eclipse with a favorite landscape, but I wasn’t going to let that happen again for last week’s lunar eclipse.
Viewed from Death Valley’s Zabriskie Point in winter, the setting full Moon’s azimuth aligns nicely with Manly Beacon, one of the park’s most recognizable features. Though this year’s alignment was particularly good, the morning of the eclipse was a day earlier than I’d normally photograph the Zabriskie Point moonset—the next day the Moon would be setting about 45 minutes later, providing ample time to photograph the landscape in the warm early light before the Moon descended behind the Panamints. Nevertheless, I decided that a total lunar eclipse trumps everything, and since Zabriskie was the best place for the eclipse, that’s where we were.
We started with telephoto compositions of the beautiful “blood Moon” phase because there wasn’t enough light to include the eclipsed Moon with the landscape without compositing two exposures. Composites are fine, but I prefer capturing scenes with one click. For wider images that included the landscape I waited until totality had passed, shortly before the Moon set, and switched to the Sony/Zeiss 24-70 with my Sony a7RIII, moving my Sony 100-400 GM to my Sony a7RII.
I captured this image about 25 minutes before sunrise, normally too early to capture landscape detail without over exposing the Moon. But this morning, following the total eclipse, the lit portion of the moon was still darkened by Earth’s penumbral shadow, which reduced the dynamic range to something my cameras could handle.
To enlarge the Moon and emphasize its juxtaposition with Manly Beacon, I went with the 100-400. With my composition and focus set, I slowly dialed up the shutter speed until I saw my a7RII’s pre-capture “zebra” highlight alert. After clicking I magnified my image preview and examined the moon to confirm that I did indeed still have detail. The foreground was quite dark on my LCD, but my histogram indicated the shadows were recoverable, something I later confirmed in Lightroom.
Click an image for a closer look and slide show. Refresh the window to reorder the display.
Posted on February 1, 2018
Since everyone else seems to be doing it, I thought I’d join the party….
I always schedule my Death Valley workshop to coincide with the January (or early February) full Moon, so it was just a coincidence that North America’s first super (a full Moon that’s within 90 percent of its closest approach to Earth), blue (the second full moon of a given month), blood (a lunar eclipse: a full Moon that passes into the Earth’s shadow and is bathed in light stripped of all but its red wavelengths by Earth’s atmosphere) Moon in 150 years coincided with my workshop. But since we were already there….
I got my group up to Zabriskie Point at around 4:30, well into the eclipse but before totality. Unlike most group photo events I’ve experienced, this morning’s crowd at Zabriskie was a little subdued—I suspect due to the early hour. Compared to the solar eclipse I photographed last August, a lunar eclipse moves with the speed of a glacier. While it was underway, I was able to assist my workshop students, set up my own equipment, switch lenses and camera bodies, experiment with exposure, gawk at the spectacle, and still had plenty of time to chat, laugh, and marvel with the rest of my group.
Starting with my Sony a7RIII, Sony 100-400 f/4 GM, and Sony 2x teleconverter, I cranked my focal length all the way out to 800mm and started clicking. After a while I pulled out my Sony/Zeiss 24-70 f/4, putting it on the a7RIII and switching the telephoto setup to my a7RII. Since time wasn’t a concern, I only used one tripod, switching the two bodies back and forth as my needs dictated.
Throughout the eclipse the Moon was softened by a thin layer of cirrus clouds. This image is among my first of the morning, before the Moon reached a band of denser clouds close to the horizon. I ended up with more creative captures, but those will need to wait for another day.
Posted on January 7, 2018
I used to resist using the supermoon label because it’s more of a media event than an astronomical event, and it creates unrealistic expectations. But since the phenomenon appears to be with us to stay, I’ve changed my approach and decided to take advantage of the opportunity to educate and encourage.
What’s the big deal?
So just what is so “super” about a “supermoon?” Maybe another way of asking the question would be, if I hadn’t told you that the moon in this image is in fact a supermoon, would you be able to tell? Probably not. So what’s the big deal? And why do we see so many huge moon images every time there’s a supermoon? So many questions….
Celestial choreography: Supermoon explained
To understand what a supermoon is, you first have to understand that all orbiting celestial bodies travel in an ellipse, not a circle. That’s because, for two (or more) objects to have the gravitational relationship an orbit requires, each must have mass. And if they have mass, each has a gravitational influence on the other. Without getting too deep into the gravitational weeds, let’s just say that the mutual influence the earth and moon have on each other causes the moon’s orbit to deviate ever so slightly from the circle it seems to be (without precise measurement): an ellipse. And because an ellipse isn’t perfectly round, as it orbits earth, the moon’s distance from us depends its position in its orbit.
An orbiting object’s closest approach to the center of its ellipse (and the object it orbits) is at “perigee”; its greatest distance from the ellipse’s center is “apogee.” And the time it takes an object to complete one revolution of its orbit is its “period.” For example, earth’s period is one year (365.25-ish days), while the moon’s period is a little more than 27 days.
But if the moon reaches perigee every 27 days, why don’t we have a supermoon every month? That’s because we’ve also added “syzygy” to the supermoon definition. In addition to being a great Scrabble word, syzygy is the alignment of celestial bodies—in this case it’s the alignment of the sun, moon, and earth (not necessarily in that order). Not only does a supermoon need to be at perigee, it must also be syzygy.
Syzygy happens twice each month, once when the moon is new (sun-moon-earth), and again when it’s full (sun-earth-moon). (While technically a supermoon can also be a new moon, the full moon that gets all the press because a new moon isn’t visible.) Since the earth revolves around the sun as the moon revolves around earth, the moon has to travel a couple extra days each month to achieve syzygy. That’s why the moon reaches perigee ever 27 days, but syzygy comes every 29.5 days, and the moon’s distance from earth is different each time syzygy is achieved.
The view from earth: Supermoon observed
While perigee, apogee, and period are precise terms that can be measured to the microsecond, a supermoon is a non-scientific, media-fueled phenomenon loosely defined a moon that happens to be at or near perigee when it’s full. To you, the viewer, a full moon at perigee (the largest possible supermoon) will appear about 14% larger and 30% brighter than a full moon at the average distance. The rather arbitrary consensus definition of the distance that qualifies a moon as a supermoon is a full moon that is within 90 percent of its closest approach to earth.
I really doubt that the average viewer could look up at even the largest possible supermoon and be certain that it’s different from an average moon. And all those mega-moon photos that confuse people into expecting a spectacular sight when there’s a supermoon? They’re either composites—a picture of a large moon inserted into a different scene—or long telephoto images. I don’t do composites, but they’re a creative choice that I’m fine with others doing as long as they’re clearly identified as composites.
For an image that’s not a composite, the moon’s size in the frame is almost entirely a function of the focal length used. I have no idea whether most of the moons the full moon gallery below were super, average, or small. The images in this and my previous blog post were indeed super, taken within minutes of each other last Sunday evening, at completely different focal lengths.
Every full moon is super
A rising or setting full moon is one of the most beautiful things in nature. But because a full moon rises around sunset and sets around sunrise, most people are eating dinner or sleeping, and seeing it is usually an accident. So maybe the best thing to come of the recent supermoon hype is that it’s gotten people out, cameras or not, to appreciate the beauty of a full moon. If you like what you saw (or photographed), mark your calendar for every full moon and make it a regular part of your life—you won’t be sorry.
Click an image for a closer look and slide show. Refresh the window to reorder the display.