River reflection in the sky, Rhine, Switzerland

Last updated on September 16, 2023

River Reflection in the Sky, Rhine, Switzerland

Have you ever witnessed a peculiar phenomenon in the sky that left you perplexed? I recently had such an experience when I observed a bright streak in the sky that defied explanation at first. It resembled an anti-crepuscular ray but had a curved trajectory, contrary to what one would expect. After some contemplation, I realized that I was witnessing a reflection of the river Rhine in Switzerland, illuminated by the low-hanging sun.

The conditions required for this captivating spectacle to occur are quite specific. First and foremost, bright sunshine must be bathing the river while thick clouds dominate the rest of the sky. These contrasting elements create the perfect canvas for the reflection to manifest. Additionally, a low-angled sun is essential for optimal reflection on the water's surface. When sunlight glances across the water at a shallow angle, it mirrors the surroundings most vividly.

To witness this phenomenon, a mirror-smooth river is necessary. Any disturbances such as wind, wildlife, or boat wakes can disrupt the perfect stillness needed for the reflection to appear. It is this serene state of the Rhine that allows us to observe the mirrored projection of its shape onto the underside of stratocumulus clouds. The absence of ripples that typically scatter reflections enables us to witness this remarkable sight.

This occurrence is indeed rare, as it relies on a specific combination of factors aligning at the same time. The sun must be positioned low in the sky, casting its rays across the river's surface. Meanwhile, thick stratocumulus clouds should dominate the sky away from the sun, creating a stark contrast between light and shadow. It is this interplay of light and cloud cover that allows for the reflection to become visible.

The phenomenon of river reflection in the sky serves as a reminder of the interconnectedness of our natural environment. The alignment of sunlight, clouds, and water creates a stunning visual display that captivates observers. It is a testament to the beauty and complexity of atmospheric optics, showcasing the intricate ways in which light interacts with our surroundings.

If you ever have the opportunity to witness this spectacle, take a moment to appreciate the delicate balance required for such an event to occur. Nature's artistry is often fleeting, and capturing these moments can be a challenge. However, the memories and awe-inspiring images that result from witnessing the river reflection in the sky are sure to leave a lasting impression.

In conclusion, the reflection of the river Rhine in the sky is a captivating atmospheric optics phenomenon. It requires specific conditions, including bright sunshine on the river, thick clouds away from the sun, and a low-angled sun. The river must be perfectly still, without any disturbances that could disrupt the reflection. This rare occurrence showcases the intricate interplay of light, clouds, and water, reminding us of the beauty and complexity of our natural environment. So, keep your eyes to the sky and you might just witness this remarkable sight for yourself.

As scene on the Rhine in Switzerland by Juerg Alean.

"Yesterday, I saw a most curious bright streak in the sky which, at first, I could not explain. It looked like an anti-crepuscular ray, but it was curved and going the wrong way (not towards the antisolar point).

Then I realized that it was a reflection of the river Rhine on which the very low sun was shining.

The Rhine was flat like a mirror. Usually there are little ripples which scatter reflections. So we literally see the shape of the Rhine projected on to the underside of the stratocumulus clouds."

A rare event! We need:

Bright sunshine on the river but thick cloud away from the sun to show the reflection.

A low sun. Water, like glass, reflects best when light glances across at a low angle.

A mirror smooth river. No wind, ducks, swans or boat wakes.

Another of Juerg

Alean's river scenes.

Anticrepuscular rays produced by rain shadowing converge on the antisolar point.

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Reference Atmospheric Optics

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