Celestial Phenomenas are fascinating almost daily occurrences. If you are not observing the nature consciously you'll miss many spectacular phenomena of the light in the earth atmosphere. In central Europe colourful rainbows and halos are often visible. Sister Suns are also viewed on a regular basis as reflections on cold or hot air are (mirages). On higher altitudes and latitudes (e.g, Lapland in Europe ) and with sinking temperatures the phenomena around ice crystals in the air reflecting and refracting sun rays are visible.