What is the optical illusion called where our sun seems to disappear from view and then rise on the third day? And where can it be viewed from?

The optical illusion you're referring to is known as the "disappearing sun" phenomenon, which is often associated with the "Midnight Sun" effect in polar regions. This intriguing occurrence happens due to the unique positioning of the Earth in relation to the sun, particularly during certain times of the year. While it may seem like the sun disappears and reappears, it’s actually a result of the Earth’s tilt and orbit around the sun.

Understanding the Disappearing Sun Phenomenon

During the summer months in polar regions, such as parts of Norway, Sweden, and Alaska, the sun can remain visible for 24 hours a day. Conversely, during the winter months, these areas experience prolonged darkness, where the sun does not rise above the horizon for several days or even weeks. This is particularly evident around the winter solstice, when the sun appears to "disappear" for a few days before it starts to rise again.

Where to Experience This Illusion

If you're interested in witnessing this phenomenon, the best places to visit are:

• Norway: The North Cape and Svalbard are famous for their extreme daylight variations.
• Sweden: Abisko National Park offers stunning views of the sun during the summer months.
• Alaska: Areas like Barrow (Utqiaġvik) experience long periods of darkness in winter and continuous daylight in summer.

The Science Behind the Illusion

This optical illusion is primarily due to the Earth's axial tilt of approximately 23.5 degrees. As the Earth orbits the sun, different regions receive varying amounts of sunlight throughout the year. During the summer solstice, the North Pole is tilted toward the sun, resulting in continuous daylight. Conversely, during the winter solstice, the North Pole is tilted away, leading to extended periods of darkness.

Visualizing the Effect

Imagine standing at the North Pole during the summer. The sun circles the horizon, never fully setting. As you move toward the equator, the sun will rise and set more traditionally. However, in the polar regions, the sun's path is more horizontal, creating the illusion that it is "disappearing" and "reappearing" as the seasons change.

Conclusion

In summary, the disappearing sun phenomenon is a fascinating optical illusion tied to the Earth's tilt and orbit. To experience this unique event, visiting polar regions during their respective summer or winter solstices will provide the best opportunity to witness the sun's dramatic behavior. It's a beautiful reminder of the intricate dance between our planet and the sun!