Introduction
Have you ever looked up at the night sky and noticed a mysterious circle around the moon? Many people have observed this phenomenon and wondered what causes it. In this article, we will explore the reasons behind the circle around the moon.
Atmospheric Optics
The circle around the moon is actually a lunar halo, which is caused by the refraction, reflection, and dispersion of light through ice crystals in the atmosphere. When the moonlight passes through these hexagonal ice crystals, it is bent at a 22-degree angle, creating a halo effect.
Types of Halos
There are several types of halos that can appear around the moon, including a 22-degree halo, a circular halo, and a moon dog. Each type is formed by different atmospheric conditions and types of ice crystals.
- 22-Degree Halo: This is the most common type of halo and appears as a circular ring around the moon at a 22-degree angle.
- Circular Halo: This type of halo forms a complete circle around the moon, often with colorful bands of light.
- Moon Dog: A moon dog is a bright spot that appears on either side of the moon, also caused by ice crystals.
Historical and Cultural Significance
Throughout history, lunar halos have been seen as omens or signs of impending change. In various cultures, they are associated with mystical or supernatural meanings, such as bad weather, war, or good luck.
Case Studies
In 2017, a spectacular lunar halo appeared over the city of Moscow, mesmerizing residents and tourists alike. The phenomenon was captured on camera and shared widely on social media, sparking interest and curiosity about lunar halos.
Conclusion
The circle around the moon may seem mysterious and magical, but it is actually a natural optical phenomenon caused by the refraction of moonlight through ice crystals in the atmosphere. Next time you see a lunar halo, take a moment to appreciate the beauty and wonder of the night sky.
