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🌌 #7: Bortle Scale & Dark Skies

Posted on September 28, 2018Mai 25, 2025 by admin

This night was something special: my first truly conscious experience under a genuinely dark sky.

Discovering Darkness

In northern Germany, there are still a few rare locations where the population thins out enough to offer proper dark skies. I was staying with my family in one such spot — a quiet holiday resort far from the reach of city lights. Up to that point, I had never really appreciated what a dark sky meant from an astronomer’s perspective. Sure, nights are dark — but there’s a world of difference between a dim night near a city and a truly dark sky.

It was during this stay that I stumbled upon the Bortle Scale, a system used to classify night sky darkness. It considers factors like skyglow, cloud illumination, the visibility of the Milky Way, and whether you can spot deep sky objects unaided. My home sky falls into Bortle 6, which is fairly light-polluted. The holiday resort, on the other hand, was closer to Bortle 3 — and even that made an incredible difference.

The stars were vivid, countless, and overwhelming. I suddenly realized what I had been missing all along.

Once in Australia…

I had a similar — perhaps even more powerful — experience in northern Australia, in a place called Cape Tribulation. It’s a tiny village tucked between rainforest and coastline. One moonless night, my family and I ventured to the beach (yes, crocodiles!) to stargaze.

And there it was. The Milky Way arching overhead in full glory. According to the Bortle Scale, skies like that fall into Bortle 1 or 2 territory. One line on the scale says it all:

“The Scorpius and Sagittarius regions of the Milky Way cast obvious shadows.”
And they did.

If you’re ever fortunate enough to experience a sky like that, you’ll never look at streetlights or light pollution the same way again.

📾 Capturing the Night

The images below were taken with my LG G6 smartphone, using 20-second exposures at f/1.8 and ISO 800. No stacking, no filters — just single frames. It’s amazing how much starlight you can capture with minimal gear under the right conditions.

Later, on October 4th, 2018, I took another image under my regular Bortle 6 sky. This one-shot frame (30 seconds at ISO 800) tells a very different story. The sky glows red, the horizon is washed with light from a nearby town, and the stars fade into the haze. You can still see the Pleiades (M45), but it’s clear: the brighter your sky, the brighter an object must be to stand out. Faint DSOs are nearly lost — unless you rely on narrowband filters or other tricks.

🌍 Final Thoughts

Experiencing a dark sky firsthand is something every astrophotographer should seek out. It changes everything — your exposures, your expectations, your whole relationship with the night. Just remember: real darkness isn’t found a few kilometers outside the city. Sometimes, it takes a long drive
 or even a journey to the other side of the planet.

Clear skies,
Chris

Beitrags-Navigation

← #6: M101, Mars, and the Moon
🌌 #8: Andromeda, Hercules and the Pleiades →

SPACE NEWS

June 1:
Venus reaches its greatest western elongation, shining brilliantly in the pre-dawn sky. Ideal for morning planetary imaging—look east just before sunrise.

June 2:
The Great Hercules Cluster (M13) reaches its highest point in the sky. Excellent for telescopic astrophotography from dark-sky sites.

June 5:
Celebrate Galactic Tick Day—a quirky astronomical milestone marking our Solar System’s orbit around the Milky Way.

June 7:
The Arietid meteor shower peaks. While mostly active during daylight, early risers may catch a few bright meteors before dawn.

June 11:
The Strawberry Full Moon reaches its peak. It will be the lowest full moon in 18 years—look for its large golden glow near the horizon.

June 16:
Mars and Regulus appear close in the evening sky. Also, the Butterfly Cluster (M6) in Scorpius is at its best for deep-sky imaging.

June 19:
The Moon and Saturn meet in the early morning sky. A beautiful conjunction for wide-field or planetary setups.

June 21:
The June Solstice arrives at 02:42 UTC. The longest day in the Northern Hemisphere and shortest in the Southern—welcome the new season!

June 22:
The Lagoon Nebula (M8) in Sagittarius is ideally placed for observation. Use wide-field optics to capture its glowing clouds.

June 23:
The Moon passes near Uranus and the Pleiades before dawn. A great triple subject for wide-field astrophotography.

June 25:
New Moon. The sky is at its darkest—perfect conditions for Milky Way and deep-sky imaging.

June 27:
The June Boötid meteor shower peaks. Usually low in activity, but dark skies may reward patient observers with unexpected bursts.

June 29:
A conjunction of Saturn and Neptune offers a rare opportunity to frame two distant giants together.

June 30:
The Moon occults Mars in a dramatic celestial event visible from select regions—ideal for a lunar-planetary time-lapse.

All Month:
The Milky Way core is rising higher each night. Use the new moon week for wide-field shots from southern skies or dark rural locations.

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