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.
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