Rainbow - Rainbow - Rainbow - Arc - en - ciel observed in Brittany on...

Rainbow - Rainbow - Rainbow - Arc - en - ciel observed in Brittany on 2 May 2005. 23 minutes before the sun sets, a contrasting rainbow appears in the east. It is very high (the lower the Sun, the higher the bow). Note at the level of the “feet” of the rainbow the difference in luminosite between the interior of the rainbow (under the main arch) and the band between the main arch and the secondary arch (lower and higher). This dark band is called Alexander's Band. It should also be noted that blue is almost absent from the rainbow, because the Sun is setting, therefore orange, betrays a blue light faults that can be seen at the level of the rainbow. May 2, 2005. 23 minutes before the sunset, a contrasted rainbow appear toward the East. It's a tall rainbow, because the Sun is low. Notice the difference of luminosity at the “” feet”” of the rainbow between the inside of the rainbow (under the main arc) and the band located between the main and secondary arcs (fainter and higher). This darker band is called the Alexander's dark band. Notice too that the blue tints are missing in the rainbow, because the sun is setting, so is orange, which means that its blue tints are absent