Crepuscular Rays: What They Are And How They Form

Crepuscular Rays - What They Are And How They Form

A sunset by itself can be one of nature's most breathtaking displays. But under the right conditions, the appearance of different shades of sunlight radiating through clouds can appear to be almost surreal.

This stunning display of light and color has been witnessed through thousands of generations across the globe and is subject of countless photographs, paintings, and other forms of art.

Due to its mystical or supernatural appearance, this phenomenon has been adopted and used by different religions and cultures to portray a form of higher power or divine presence. It is no wonder they are commonly referred to as "god rays."

However, these "magical" beams of sunlight are far from supernatural. They are called crepuscular rays and have a scientific and logical explanation.

This article illustrates what precisely crepuscular rays are, how they form, and what their characteristics are.

Crepuscular Rays Definition

As just stated, the appearance of these "god rays" has a perfectly logical and scientific explanation. But before we take a more in-depth look at its formation, one first needs to define what precisely crepuscular rays are:

What Are Crepuscular Rays?

What Are Crepuscular Rays

Crepuscular rays are shades of light that radiates up from the sun through the gaps and edges of clouds into the early evening sky during sunset.

Although it usually occurs during or after sunset and shines through patches of clouds, crepuscular rays can also appear when sunlight travels through different objects and also appear during different parts of the day under the right conditions.

Although crepuscular rays can technically appear throughout the day, the word "crepuscular" originated from the word "crepusculum," which translates to "twilight." As a result, this term is mostly used when rays of light shine up from the horizon during sunset.

(Not to be confused with a sunbeam that shines through a break in the clouds from the sun's elevated position during the day, even though they may be theoretically the same type of occurrence.)

Another reason why crepuscular rays are more noticeable during the late afternoon and early evening are that the beams of sunlight are most visible when there is a strong contrast between light and darkness. These conditions are optimal during sunset.

Although crepuscular rays seem to diverge from the sun and grow larger as they move further away, they actually run parallel to each and other and remain the same width.

The reason for this illusion is a result of observers viewing the rays from a perspective point. The same way a long road or railway track seems small at a distance and grows larger, the closer they come, the same way crepuscular rays seem to diverge away from the sun.

The rays that gets emitted through the clouds during sunset usually have an orange glow. It occurs as a result of the long path the light has to travel through the atmosphere. Particles in the air scatter blue light, while more yellow and red light is allowed to pass through.

How Crepuscular Rays Form

When the sun is near or just below the horizon, it's rays travels up in the darkening sky. When scattered cloud formations are present low in the sky, beams of sunlight travels through gaps and across the edges these clouds.

Crepuscular Rays

The reason that the rays of light are visible at all is that particles of dust and small droplets are present in the atmosphere, especially closer to the horizon. These particles scatter and refract the light passing through them, making it visible to the naked eye.

As crepuscular rays pass through the clouds, different shades of colors create the appearance of multiple beams of light which is as a result of the density of the medium through which they travel.

Since clouds have different levels of density, it allows different percentages of light through. The clear openings and areas of least density allow rays of light to shine through relatively unaffected, and they appear brighter as a result.

Areas where the cloud cover blocks a larger percentage of light, the rays that are allowed to shine through, appear much darker. This combination of light and dark parts of the same light extending into the sky, create the appearance of multiple rays with spectacular effect.

Anticrepuscular Rays: The Opposite Side Of The Same Phenomenon

Anticrepuscular Rays

At the same time that crepuscular rays occur, a similar phenomenon sometimes appears on the opposite horizon. When you turn your back to the sun, you may see dimmer but similar beams of light converging onto the opposite horizon.

These beams of light are called anticrepuscular rays. They are the same rays of light that originated from the sunset as crepuscular rays.

The bands of light from the crepuscular rays streak right across the sky until they converge toward the vanishing point on the opposite horizon.

Unlike crepuscular rays that diverge away from the sun, anticrepuscular rays converge towards the antisolar point (the position directly opposite that of the sun from the observer's point of view) on the opposite horizon.

Different Names, Similar Phenomenon

As already briefly touched on during the introduction, crepuscular rays have many different names. Some simply are the name different cultures give to the same phenomenon, while others are rooted in religion or history.

The following list of synonyms is just a small sample of the different names given to crepuscular rays:   

  • God Rays: The name originated from religion, specifically Christianity, where the rays are commonly used to depict a divine presence. The effect and its description are also popular among artists and illustrators.
  • Jacob's Ladder: The name is derived from the Old Testament in The Bible, where Jacob had a dream of a staircase extending all the way to Heaven.
  • Sun Drawing Water: This synonym is based on an old Greek belief system that the rays of sunlight pulls water into the atmosphere.
  • Ropes of Maui: This name is based on the tale of the mythical Maui Potiki, who tied ropes to the sun to make the days last longer.

Other names include Buddha rays, light shafts, Tyndall rays, and sunbursts. These are just a few examples, but gives a good indication of just how widespread and significant crepuscular rays are across countries and religions.

Conclusion

As breathtaking and surreal crepuscular rays may seem to be, this post clearly illustrated how every aspect of its appearance has a perfectly logical and scientific explanation. This should not detract in any way from what is one of nature's most beautiful displays. 

This article illustrated what precisely crepuscular rays are, how they form, and what their characteristics are. It also had a look at how widespread and significant this phenomenon is, by looking at the various names given to it by different cultures and throughout history.

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Until next time, keep your eye on the weather!

Wessel


Wessel Wessels
 

Lifelong weather enthusiast and researcher. Interested in all things weather-related, and how global climate and local weather interact. Owner of multiple home weather stations for almost two decades, but still learning and expanding his knowledge base every day. He is dedicated to sharing his expertise and knowledge to get more people involved and interested in both their local and global weather and how it interacts with climate on a worldwide scale. Love sharing my knowledge on home weather stations, how they work, and the many ways you can use them to your advantage. All in all, he is just a bit of weather nerd.

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