Rainbow image taken over my sisters property in south western Victoria, Australia last weekend.
Camera Olympus E-30, focal length 14.0,
Shutter speed 1/800s, f.6.3, ISO 200.
A rainbow is an optical and meteorological phenomenon that causes a spectrum of light to appear in the sky when the Sun shines onto droplets of moisture in the Earth’s atmosphere. They take the form of a multicoloured arc, with red on the outer part of the arc and violet on the inner section of the arc.
A rainbow spans a continuous spectrum of colours; the distinct bands are an artifact of human colour vision. The most commonly cited and remembered sequence, in English, is Newton’s sevenfold red, orange, yellow, green, blue, indigo and violet (popularly memorized by mnemonics like Roy G. Biv). Rainbows can be caused by other forms of water than rain, including mist, spray, and dew.
Mythology ~ Rainbows in mythology
The rainbow has a place in legend owing to its beauty and the historical difficulty in explaining the phenomenon.
In Greek mythology, the rainbow was considered to be a path made by a messenger (Iris) between Earth and Heaven. In Chinese mythology, the rainbow was a slit in the sky sealed by goddess Nüwa using stones of five different colours.
In Hindu mythology, the rainbow is called Indradhanush, meaning “the bow (Sanskrit and Hindi: dhanush is bow) of Indra, the god of lightning, thunder and rain”. Another Indian mythology says the rainbow is the bow of Rama, the incarnation of Vishnu. It is called Ramdhonu in Bengali, dhonu (dhanush) meaning bow. Likewise, in mythology of Arabian Peninsula, the rainbow, called Qaus Quzaħ in Arabic, is the war bow of the god Quzaħ.
In Norse Mythology, a rainbow called the Bifröst Bridge connects the realms of Ásgard and Midgard, homes of the gods and humans, respectively. The Irish leprechaun’s secret hiding place for his pot of gold is usually said to be at the end of the rainbow. This place is impossible to reach, because the rainbow is an optical effect which depends on the location of the viewer. When walking towards the end of a rainbow, it will appear to “move” further away (two people who simultaneously observe a rainbow at different locations will disagree about where a rainbow is).
In Christianity, after Noah’s flood the Bible relates that the rainbow gained meaning as the sign of God’s promise that terrestrial life would never again be destroyed by flood.
Another ancient portrayal of the rainbow is given in the Epic of Gilgamesh: the rainbow is the “jewelled necklace of the Great Mother Ishtar” that she lifts into the sky as a promise that she “will never forget these days of the great flood” that destroyed her children. (The Epic of Gilgamesh, Tablet Eleven)
Then Ishtar arrived. She lifted up the necklace of great jewels that her father, Anu, had created to please her and said, “Heavenly gods, as surely as this jewelled necklace hangs upon my neck, I will never forget these days of the great flood. Let all of the gods except Enlil come to the offering. Enlil may not come, for without reason he brought forth the flood that destroyed my people.”
In the Dreamtime of Australian Aboriginal mythology, the rainbow snake is the deity governing water.
In New Age and Hindu philosophy, the seven colours of the rainbow represent the seven chakras, from the first chakra (red) to the seventh chakra (violet).