Astrophotography Blog: Bortle Class 1

Showing posts with label Bortle Class 1. Show all posts

Saturday, October 4, 2025

Rainbow of the Milky Way and the Eternal Baobab — Tarangire, Tanzania

On the midnight of September 26, 2025, under the deep African sky, I captured one of the most surreal moments of light and life. The photograph — a 21-image panorama taken with my Canon EOS Ra and Canon EF 200 mm f/2.8L II USM lens (f/3.2, ISO 25 600, 15 s exposure) — reveals the Milky Way arcing like a celestial rainbow above a solitary baobab tree in Tarangire National Park, Tanzania.

Rainbow of the Milky Way above a Baobab tree in Tarangire National Park, Tanzania — long-exposure Africa astrophotography captured with Canon EOS Ra.

Rainbow of the Milky Way and the Eternal Baobab - Tarangire National Park, Tanzania

This is a single-night image, stitched in Photoshop, but it carries the weight of millennia — both cosmic and earthly.

The Baobab: The Tree of Life

At the center of the frame stands the baobab (Adansonia digitata), often called the Tree of Life. Native to the dry savannas of sub-Saharan Africa, this extraordinary species grows in scattered populations across Tanzania, Madagascar, and parts of the Sahel. Baobabs can live for over 2 000 years — some carbon-dated specimens have reached 2 500 to 3 000 years old — silently witnessing the passing of generations, civilizations, and climates.

Baobab

Their immense trunks, often more than 10 meters in diameter, are actually natural reservoirs; a single tree can hold up to 120 000 liters of water within its fibrous tissue. In the dry season, elephants and baboons are sometimes seen peeling their bark to reach the moisture inside.

In African folklore, the baobab is a sacred symbol — a meeting of heaven and earth. Its branches, reaching skyward like roots, gave rise to legends that the gods planted it upside-down. Standing beside one beneath the Milky Way, the resemblance to a cosmic silhouette feels almost intentional.

Tarangire: The Quiet Heart of the Savanna

Located just south of the equator in northern Tanzania, Tarangire National Park is a sanctuary of vast plains, ancient river valleys, and herds of elephants. Its skies are among the clearest and darkest in East Africa, especially during the dry season from June to October.

That night, around midnight, the air was perfectly still. The southern Milky Way rose high overhead, and the galactic core shimmered in a curtain of color rarely visible to the naked eye.

The Airglow

The subtle green, red, and orange tones in the photo are not from city lights — they are natural airglow, an atmospheric phenomenon that occurs when molecules in the upper atmosphere (about 85–100 km up) emit faint light after being energized by the Sun during the day.

Contrary to popular belief, strong airglow is not limited to the poles; it is often most intense near the equator, where the upper atmosphere experiences greater gravity-wave activity and chemical recombination. Near-equatorial latitudes like Tarangire (~4° S) often produce beautifully structured bands of red (from oxygen at ~250 km) and green (from oxygen at ~95 km) that shimmer across the night sky — invisible to human eyes but captured vividly in long-exposure astrophotography.

What you see above the baobab, therefore, is not light pollution but the Earth itself glowing, whispering its quiet luminescence into the darkness.

A Meeting of Earth and Sky

This image is a meeting of contrasts: an ancient tree rooted in the soil of Africa, and a galaxy 100 000 light-years across suspended above it. Between them, a living, breathing layer of atmosphere paints the bridge — the airglow, the breath of our planet.

Under the Milky Way in Tarangire National Park, Tanzania — Baobab tree beneath the galactic core captured during Africa astrophotography expedition.

Under the Milky Way: A Night in Tarangire

Every color in the image tells a story:

Amber and red: oxygen recombining high above the equator.
Soft green: the pulse of Earth’s upper atmosphere.
Silver stars: the spiral arm of the Milky Way.
Dark silhouette: a 1 000-year-old baobab tree watching the cosmos turn.

In that moment, Tarangire was not just a national park — it was a reminder that the planet itself participates in the night sky.

Technical Notes

Camera: Canon EOS Ra (modified for astrophotography)
Lens: Canon EF 200 mm f/2.8L II USM
Settings: f/3.2 · 15 s · ISO 25 600
Panorama: 21 frames combined in Adobe Photoshop
Date: September 26, 2025
Location: Tarangire National Park, Tanzania (~4° S latitude)

Reflection

When I look at this photograph, I see time itself — the timeless patience of the baobab and the ceaseless motion of the stars. Both are survivors: one through endurance, the other through orbit.

Under that rainbow Milky Way, I realized that the Earth doesn’t just reflect the universe — it participates in it. The light that touched the baobab that night had traveled for tens of thousands of years, only to meet the glow of our own atmosphere.

Thursday, October 10, 2024

The Milky Way Over the Sailing Stone: A Night Under the Stars at Racetrack Playa, Death Valley National Park, California

Racetrack Playa is a place of natural intrigue. Situated in the heart of Death Valley, this dry, cracked lake bed is renowned for its "sailing stones" — large rocks that mysteriously move across the playa, leaving long tracks behind them. For decades, these stones puzzled scientists and visitors alike, as no one could quite figure out how these hefty rocks glided across the desert floor. It wasn’t until recently that a rare combination of ice, water, and wind was identified as the culprit behind their movement.

The Milky Way over the sailing stones at Racetrack Playa, Death Valley National Park, California — night panorama astrophotography captured with Canon EOS Ra.

The Milky Way Over the Sailing Stones of Death Valley, California

Panorama 27 photos, Canon EOS Ra, EF16-35mm f/2.8L II USM Lens, f/2.8, ISO-25600, 20 seconds each photo.

When night falls at Racetrack Playa, another marvel unfolds overhead. With its location in one of the darkest national parks in the U.S., the sky above Death Valley becomes a portal to the universe. The absence of light pollution allows for one of the most pristine views of the Milky Way, an ocean of stars arching across the sky, giving photographers an ideal canvas for astrophotography.

One interesting detail in this panorama is the orientation of both the sky and the sailing stones. Near the horizon you can recognize the Big Dipper (Ursa Major) in a low position, while the Little Dipper (Ursa Minor) is also visible, with Polaris (the North Star) marking the direction of true north.

At this low altitude, the familiar shape of the Big Dipper appears more flattened than usual. One of its stars, Phecda, is not clearly visible, but the remaining main stars are still recognizable, allowing the asterism to be identified.

Racetrack Playa is located at a latitude where the Big Dipper is circumpolar, meaning it can be seen throughout the entire year. As the night progresses, it slowly rotates around Polaris, changing its position while always remaining above the horizon.

The movement of the stones in the foreground adds another layer of interest. The main sailing stone in the center shows a trail roughly aligned with the north–south direction, appearing to move from the direction of Polaris toward the observer. However, a second stone on the right side of the frame reveals a different trajectory, with its path running almost perpendicular to the main stone’s trail.

This variation highlights the complex and delicate conditions behind the sailing stones phenomenon. Their motion depends on a rare combination of thin ice sheets, shallow water, and shifting wind, allowing different stones to move at different times and in different directions, creating a network of intersecting trails.

Together, the scene presents a striking contrast: the sky above follows predictable celestial motion around Polaris, while the desert floor records irregular and transient movement. It is a rare moment where celestial order and natural variability can be observed in a single frame.

Sailing stone and its trail on Racetrack Playa, Death Valley National Park, under the Milky Way with Big Dipper and Small Dipper visible — night panorama astrophotography captured with Canon EOS Ra.

A close-up panorama of a solitary sailing stone and its long trail beneath the Milky Way and the Dippers.

Standing in the silence of Racetrack Playa under the brilliant Milky Way, one feels both humbled and uplifted. The ancient stones, moved over time by forces unseen, seem like they are part of a larger cosmic ballet, just as the stars above trace their eternal paths through space. In that quiet desert night, there is a profound sense of stillness, yet the sky and stones speak of movement across millennia.

Tuesday, October 15, 2019

Milky Way Casting Shadows - Chile Astrophotography - San Pedro de Atacama Celestial Explorations Star Tour

We all know that the Sun and the Moon cast shadows. But can the Milky Way itself be bright enough to do the same? In extremely dark locations, the answer is yes.

This panorama was captured during the San Pedro de Atacama Celestial Explorations Star Tour in northern Chile. On the image you can clearly see shadows of the trees cast only by the Milky Way — something that is possible only under the darkest skies on Earth.

According to the Bortle Scale of night-sky brightness, this region rates as a Class 1 – Excellent Dark-Sky Site. Here, the Scorpius–Sagittarius region of the Milky Way is so bright that it produces detectable diffuse shadows on the ground. It is an extremely rare and unforgettable sight.

For observers hoping to witness Milky Way shadows themselves, sky conditions matter as much as sky darkness. A Bortle Class 1 site is essential, but it is usually not sufficient on its own. The Galactic Center, located in the Scorpius–Sagittarius region, must be well above the horizon, where the Milky Way’s surface brightness reaches its maximum.

Shadows are not produced by individual stars, but by the combined light of billions of stars concentrated toward the Galactic Core. When this region is high in the sky and atmospheric extinction is minimal, the Milky Way can generate subtle but detectable contrast between illuminated and shaded areas on the ground.

The effect becomes even more noticeable when a bright planet such as Jupiter is present near the Milky Way, subtly reinforcing the overall illumination. Only when these conditions align — a true Bortle Class 1 sky, the Milky Way core high above the horizon, and additional planetary light — do Milky Way shadows become realistically observable.

Milky Way casting visible shadows on the desert ground during a star tour near San Pedro de Atacama, Chile — astrophotography by astroval1.

Milky Way Casting Shadows - Chile Astrophotography - San Pedro de Atacama Celestial Explorations Star Tour

Near the horizon, green and red airglow is visible — a natural atmospheric luminescence often seen in extremely dark locations. The brightest “star” in the middle of the panorama is actually Jupiter.

Technical details:
Canon 60Da • EF16–35mm f/2.8L II USM • 25 sec • f/2.8 • ISO 6400
Panorama of 20 photos.

A slightly different version of this image was selected as the Dark Sky Travels Magazine – Image of the Day (17 November 2019).

Dark Sky Travels Magazine

Dark Sky Travels Magazine Image of the Day

This photograph was captured in the Atacama Desert, Chile—one of the premier astrophotography locations on the planet. Many of the world’s leading observatories operate here (the other major hub is Hawai‘i’s Mauna Kea).

The image was taken near a small oasis where a few trees are present. It is astonishing to stand in near-total natural darkness and see shadows cast not by any artificial light, but by the bright central bulge of the Milky Way and the planet Jupiter.

This is what a true Bortle Class 1 sky looks like — the very definition of a perfect dark-sky environment.

Experiences like this reveal the Milky Way not as a distant backdrop, but as a luminous structure capable of shaping the landscape itself — a reminder of what the natural night sky can truly be.

Tuesday, September 17, 2019

Bolivia Astrophotography - Salar de Uyuni at Night

These photographs capture an unforgettable night under the stars at the Salar de Uyuni in Bolivia — a place that feels almost unreal after dark. Shot during a guided Uyuni stargazing tour, the images reveal the brilliance of the southern hemisphere night sky above the world’s largest salt flat.

At an elevation of approximately 3,650 meters (12,000 feet), Salar de Uyuni offers exceptionally transparent air, minimal light pollution, and dramatic atmospheric effects. The night skies above Salar de Uyuni approach Bortle Class 1 on the dark-sky scale. Such skies allow the Milky Way to appear extremely bright and structured, with visible airglow and exceptional contrast even at low elevations above the horizon. The result is a sky filled with intense star fields, vivid red and green airglow, and prominent southern constellations such as Crux (the Southern Cross).

The vast salt surface creates a unique foreground for astrophotography. Distinct hexagonal salt patterns, formed by crystallization as water evaporates, are visible even at night and provide scale and texture beneath the Milky Way.

Camera & Settings:
Canon EOS 60Da
Canon EF 16–35mm f/2.8L
30 seconds · f/2.8 · ISO 6400
Panoramic night-sky composition

Milky Way rising diagonally above the salt horizon at Salar de Uyuni, Bolivia, under southern hemisphere night sky

Bolivia Astrophotography - Salar de Uyuni at Night

In this first image, the Milky Way rises diagonally from the salt horizon on the left toward the upper right of the frame. The Galactic Center is clearly visible, glowing intensely against the high-altitude sky.

Person illuminated by a small light beneath the Milky Way at Salar de Uyuni, showing scale and detail against the salt flat

Salar de Uyuni Milky Way Bolivia Astrophotography

The second image includes a person illuminated by a small light source. This provides a clear sense of scale against the immense salt flat and highlights how the Milky Way and airglow dominate the high-altitude night sky.

Southern hemisphere Milky Way and airglow above Salar de Uyuni salt flat at high altitude

Southern hemisphere night sky Milky Way Bolivia Astrophotography

The third image highlights the richness of the southern Milky Way combined with subtle airglow colors — a signature of extremely dark, high-altitude observing sites. The Crux constellation (Southern Cross) is especially well defined here, as this frame was captured with a tighter field of view and moderate zoom rather than as part of a wide panoramic sweep.

With over 10,500 km² of salt, more than 10 billion tons of crystalline deposits, and up to 70% of the world’s known lithium reserves, Salar de Uyuni is not only a geological wonder, but also one of the most extraordinary natural platforms for night-sky photography on Earth.

Wednesday, September 4, 2019

Zodiacal Light Bolivia Astrophotography

This Zodiacal Light astrophotography image was captured in the high Andes of Bolivia, approximately two hours after sunset, during a New Moon night. The observation site was near Hotel Jardines De Mallku Cueva, at an elevation of 4,020 meters (13,190 feet), where the atmosphere is exceptionally clear and dry.

The faint triangular glow rising from the western horizon is the zodiacal light, aligned with the ecliptic plane. Jupiter is visible near the top of the frame, providing a natural reference point above the glowing dust column. Despite the camera’s enhanced sensitivity, the zodiacal light was clearly visible to the naked eye, a rare experience even for experienced observers.

For beginners, planets provide one of the easiest ways to locate the zodiacal light. All major planets orbit within the ecliptic plane — the same plane in which the zodiacal dust cloud is distributed. If you remember where the Sun set and can identify at least one bright planet after dusk, that planet effectively marks the path along which the zodiacal light may appear.

When two or more planets are visible, the orientation of the Solar System’s plane becomes even clearer. The same approach works before sunrise: by noting the position of a bright planet and the upcoming direction of sunrise, you can determine where to search for the faint zodiacal glow.

Modern mobile sky-mapping applications can also be helpful, but seeing zodiacal light visually offers something unique — while the plane of our Galaxy is easily traced by the Milky Way, the plane of the Solar System is far more subtle. Observing zodiacal light is one of the few ways to directly perceive that solar plane with the naked eye.

Captured with Canon EOS 60Da and Canon EF 16–35mm f/2.8L, this panorama consists of three stitched exposures, each taken at 25 seconds, f/2.8, ISO 6400.

Zodiacal Light over the Andes in Bolivia with Jupiter visible above the ecliptic, captured at 4020 meters during New Moon

Zodiacal Light over the Andes, Bolivia – New Moon astrophotography at 4,020 meters

Zodiacal light is a faint, diffuse, and roughly triangular glow visible in exceptionally dark skies, appearing along the zodiac and following the ecliptic plane. It is brightest near the horizon and gradually fades upward, tilted according to the seasonal angle of the ecliptic.

This glow is caused by sunlight scattering off microscopic interplanetary dust particles distributed throughout the inner Solar System. Most of this dust is believed to originate from cometary debris and collisions between small rocky bodies.

High-altitude locations such as the Bolivian Andes dramatically enhance zodiacal light visibility due to reduced atmospheric scattering, extremely low humidity, and minimal light pollution.

Below is a color-enhanced variation of the same zodiacal light panorama, revealing subtle gradients and dust-scattering structure that are difficult to perceive visually.

Zodiacal Light Astrophotography

The black and white version below is the closest representation of what the zodiacal light appeared like to the human eye — a soft, ghostly glow rising from the horizon, barely distinguishable from the natural night sky background.

Zodiacal Light Astrophotography Black and White

Observing zodiacal light from the high Andes of Bolivia was a reminder that not all structures in the night sky are immediately obvious. While the Milky Way clearly traces the plane of our Galaxy, zodiacal light reveals the far subtler plane of our Solar System itself — made visible only under pristine conditions. At high altitude, far from light pollution, this delicate glow becomes one of the most rewarding naked-eye experiences in night-sky observation.

Monday, July 15, 2019

Acadia National Park, Maine USA - Astrophotography

Acadia National Park, located on Mount Desert Island, Maine, is one of the darkest accessible locations on the U.S. East Coast. I honestly did not expect to witness such extraordinary sky conditions here — visible airglow, intense Milky Way contrast, and even subtle diffuse shadows cast by the Galactic Center.

After driving nearly 10 hours from New York with family and friends, we arrived under perfect conditions: new Moon, clear forecast, and dry summer air. It was a rare opportunity to test how dark the Atlantic coast can truly be.

Milky Way panorama over Sand Beach in Acadia National Park Maine showing Galactic Center and granite coastline

Acadia Astrophotography - Panorama of 4 Images Milky Way over Sand Beach

Canon 60Da, EF 16-35mm f/2.8L II USM, 25 sec, f/2.8, ISO 6400 – 4-frame panorama

Sand Beach, while just a 290-yard-long beach inlet between granite mountains, has a spectacular view of the night sky. On the Bortle Dark-Sky Scale, this spot can approach Class 1 — naturally dark and remarkably rare on the East Coast.

That darkness comes from two main factors: location and park lighting. Newport Cove helps protect the beach from sky glow from populated parts of the island. The beach faces out to the dark open ocean, and the surrounding topography blocks the line of sight from Bar Harbor, reducing residual sky glow. Park lighting is also designed to minimize light pollution.

Milky Way night landscape over Sand Beach in Acadia National Park Maine with visible green airglow and bright Galactic Core

Acadia Astrophptography Milky Way Night Landscape

Canon 60Da, EF 16-35mm f/2.8L II USM, 30 sec, f/2.8, ISO 12800

Even a single exposure reveals remarkable atmospheric structure. Subtle green airglow layers are clearly visible — a strong indicator of natural darkness.

Black and white astrophotography image of Milky Way over granite coastline in Acadia National Park

Black and White Acadia Astrophotography

Canon 60Da, EF16-35mm f/2.8L II USM, 30.0 sec; f/2.8; ISO 12800 - One photo

Monochrome emphasizes structure — granite formations, dark dust lanes, and stellar density of the Sagittarius region.

Diagonal Milky Way panorama over granite coastline at Sand Beach in Acadia National Park Maine

Night Landscape Canon Astrophotography Panorama Milky Way Acadia National Park Maine USA

Canon 60Da, EF 16-35mm f/2.8L II USM, 25 sec, f/2.8, ISO 6400 – 6-frame panorama

Night landscape with observer and headlamp beneath the Milky Way at Sand Beach in Acadia National Park Maine

Chasing the Milky Way - Acadia National Park

Wide rainbow Milky Way panorama in Acadia National Park showing green airglow and Atlantic coastline

Rainbow Milky Way - Maine Astrophotography, Acadia National Park

Canon 60Da, EF 16-35mm f/2.8L II USM, 25 sec, f/2.8, ISO 6400 – 20-frame panorama

The Sand Beach location was a perfect choice. The Galactic Center was bright enough to cast subtle diffuse shadows on the ground, and natural airglow was clearly visible. The presence of Jupiter slightly affected dark adaptation, yet the overall sky quality was extraordinary — a dramatic contrast to New York’s Bortle Class 8–9 skies.

Sand Beach feels like a small dark-sky oasis along the Atlantic coast. Just a few minutes away by car, the ocean horizon disappears, the mountains no longer shield the view, and faint light pollution becomes noticeable again. Here, however, the combination of open ocean exposure and terrain shielding creates a pocket of exceptional darkness.

Acadia proves that true darkness still exists on the East Coast — sometimes in small geographic pockets where ocean exposure and terrain combine perfectly.

For East Coast astrophotographers, this place is a hidden treasure.

Sunday, June 16, 2019

Mauna Kea Observatories, Big Island Hawaii

The purpose of life is the investigation of

the Sun, the Moon, and the heavens.

— Anaxagoras, Philosopher

Mauna Kea is one of the best places in the planet for an astronomical observation. The elevation is about 4,200 meters (13,800 ft). The atmosphere above the mountain is extremely dry and cloud-free, the proportion of clear nights is among the highest in the world with minimum optical turbulence.

Below are photos from my visit to the Mauna Kea summit and the world-class observatories that operate there.

Subaru Telescope on Mauna Kea photographed during sunset

The Subaru Telescope, operated by the National Astronomical Observatory of Japan, is one of the largest single-mirror telescopes in the world. Its 8.2-meter primary mirror is designed for deep-sky surveys and high-resolution studies of galaxies, star formation, and the early universe.

Sunset view of SMA, Subaru, Keck I and II, and NASA IRTF on Mauna Kea

From left to right the Smithsonian Submillimeter Array, the Subaru Telescope, the twin Keck I and II telescopes, and the NASA Infrared Telescope Facility - Hawaii Mauna Kea Observatories

Note, that the Submillimeter Array is important component of the Event Horizon Telescope, which made photo of the Black Hole Shadow at the center of Messier 87 Galaxy.

W. M. Keck Observatory domes on Mauna Kea during sunset light

W. M. Keck Observatory - Hawaii Mauna Kea Observatories

Keck Observatory telescopes on Mauna Kea summit glowing in sunset colors

Big Island Hawaii Mauna Kea Observatories - W. M. Keck Observatory

Very Long Baseline Array radio telescope on Mauna Kea, Hawaii

Very Long Baseline Array Radio Telescope on Hawaii - Mauna Kea Observatories

The Mauna Kea antenna is part of the VLBA (Very Long Baseline Array) — a continent-spanning radio telescope system that provides some of the highest-resolution observations in astronomy. Combining signals from antennas across the country creates a single “virtual telescope” the size of North America.

NASA Infrared Telescope Facility at Mauna Kea

NASA Infrared Telescope Facility Hawaii Observatory

Operated by NASA, the IRTF specializes in infrared studies of planets, comets, asteroids, and near-Earth objects. It plays an essential role in planetary defense and Solar System science.

Mauna Kea view above the clouds from Hawaii’s Big Island

Above the Clouds - Hawaii Mauna Kea Big Island

Being above the inversion layer means that the summit sits above most weather, haze, and moisture. Standing at the top of Mauna Kea truly feels like being on an island floating in the sky.

Driving above the clouds on Mauna Kea summit road in Hawaii

Skydriving Hawaii Mauna Kea

Vibrant sunset over Mauna Kea summit on Hawaii’s Big Island

Sunset Hawai Mauna Kea

Mauna Kea is famous for its spectacular sunsets. The sharp temperature drop and calm evening atmosphere create near-perfect observing conditions as the sky shifts from gold to deep blue.

Stargazing and Astrophotography near MaunaKea Visitor Information Station

Night sky and bright stars above Mauna Kea Visitor Information Station

Night Sky MaunaKea Visitor Information Station

The MaunaKea Visitor Information Station (VIS) is located at 9,300 ft (2,800 m) — well below the observatories but still far above city lights. It is one of the best places on the island for public stargazing, astrophotography, and safe acclimatization before heading up to the summit.

Night skies here are extremely dark, and the Milky Way is bright even to the naked eye.

Mauna Kea remains one of the most scientifically important sites in the world — a place where cutting-edge astronomy combines with some of the clearest skies on Earth. Whether you are an astronomer, astrophotographer, or simply someone who loves the night sky, visiting Mauna Kea is a powerful and unforgettable experience.