Anti-crepuscular rays

Last updated on September 16, 2023

What are Anti-Crepuscular Rays?

Anti-crepuscular rays, also known as antisolar rays, are a captivating atmospheric phenomenon that occurs when rays of sunlight appear to converge at a point opposite the sun in the sky. These rays are often observed during sunrise or sunset, when the sun is low on the horizon and casts long shadows. While crepuscular rays extend outward from the sun, anti-crepuscular rays appear to converge towards the antisolar point, which is marked by the shadow of the observer's head.

The Fascinating Display of Anti-Crepuscular Rays

When observing anti-crepuscular rays, one may be enchanted by their ethereal beauty and their ability to create a sense of depth and perspective in the sky. These rays can stretch across the entire sky, forming a captivating spectacle that is truly awe-inspiring. The wide expanse of the Netherlands, with its unbroken landscapes and expansive skies, provides an ideal setting for witnessing this phenomenon in all its glory.

The Role of Sunlight and Raindrops

One of the factors that contribute to the formation of anti-crepuscular rays is sunlight interacting with raindrops in the atmosphere. When sunlight passes through raindrops, it can create a rainbow in the sky. In some cases, the same raindrops that produce a rainbow can also scatter light in such a way that anti-crepuscular rays become visible. This interplay between sunlight, raindrops, and atmospheric conditions gives rise to a stunning display of converging rays.

Anti-Crepuscular Rays and Rainbows

Interestingly, there can be a connection between anti-crepuscular rays and rainbows. When both phenomena occur simultaneously, the anti-crepuscular rays can appear like the spokes of a wheel, with the rainbow forming its rim. This alignment creates a visually striking image, with both the rays and the rainbow sharing the same center point - the antisolar point. The combination of these two atmospheric optical phenomena adds an extra layer of wonder to the already mesmerizing display in the sky.

Observing Anti-Crepuscular Rays

To observe anti-crepuscular rays, it is best to find a location with a clear view of the horizon during sunrise or sunset. As the sun casts its rays across the sky, look in the opposite direction and search for converging beams of light. The rays may appear faint at first, but with patience and a keen eye, one can witness their full splendor. The expansive landscapes of the Netherlands offer an excellent vantage point for capturing the beauty of anti-crepuscular rays on camera.

The Science Behind Anti-Crepuscular Rays

The convergence of anti-crepuscular rays is an optical illusion created by the perspective effect. When the sun is low on the horizon, parallel rays of sunlight appear to converge due to the way our eyes perceive distance. This convergence gives rise to the stunning display of converging rays that seem to meet at the antisolar point. While the phenomenon may appear otherworldly, it is a result of the interplay between light, shadows, and our own perception.

A Global Phenomenon

Anti-crepuscular rays are not limited to specific locations but can be observed worldwide under the right conditions. Whether in the Netherlands or elsewhere, these rays can grace the skies and provide a breathtaking sight for those fortunate enough to witness them. From open fields to mountain peaks, the convergence of anti-crepuscular rays can occur in various settings, adding a touch of magic to nature's canvas.

Capturing the Magic

Photographing anti-crepuscular rays can be a rewarding experience for both amateur and professional photographers. To capture their beauty, it is essential to choose the right camera settings and composition. A wide-angle lens can help capture the expansive nature of the rays, while adjusting the exposure to balance the brightness of the sun and the surrounding sky is crucial. Patience and experimentation are key to capturing the perfect shot of this captivating atmospheric phenomenon.

The Wonders of Atmospheric Optics

Anti-crepuscular rays are just one example of the many wonders that atmospheric optics has to offer. From rainbows and halos to mirages and iridescence, the study of how light interacts with the atmosphere continues to captivate scientists and enthusiasts alike. These phenomena remind us of the intricate beauty and complexity of our natural world, providing endless opportunities for observation, exploration, and appreciation.

A Reminder of Nature's Grandeur

When we witness the convergence of anti-crepuscular rays, we are reminded of the vastness and grandeur of our surroundings. These rays serve as a reminder that even in the simplest moments, there is a hidden beauty waiting to be discovered. So, the next time you find yourself gazing at a breathtaking sunrise or sunset, take a moment to look in the opposite direction and see if you can catch a glimpse of the elusive anti-crepuscular rays, for they are a testament to the wonders that lie just beyond our gaze.

Anti-crepuscular rays near Leeuwarden, The Netherlands. The gentle unbroken landscapes and huge skies of the Netherlands are ideal for seeing these rays. Bram Verbaas took this four image 140° wide panorama from near his village of Boksum late afternoon on 17th September 2002.

Rays from all directions converge downwards to the antisolar point marked by the shadow of Bram's head and camera on the gravel track .

Faint fragments of a rainbow show in the sky to the left and right. At least some of the rays were illuminated by the sun shining on raindrops. Sometimes when there is a rainbow, anti-crepuscular rays can look like the spokes of a wheel with the bow as its rim. The rays and rainbow share the same centre - the antisolar point.

Image ©2002 Bram Verbaas, reproduced with permission.

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Reference Atmospheric Optics

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