We often get to see strange things happening in the sky and in the universe. In Thursday morning, Mongolia witnessed not one but three Suns in the sky. This celestial optical phenomenon is called 'Anthelian' which means the reflections of Sun is caused by Sunshine high in the sky and light passing through snow crystals in the air. This optical phenomenon appears only in very situation. When the temperature is below 30 degrees, the air should be filled with clouds, paper and ice crystals.