The rainbow is a promise

I like the rainy weather so much but i can remember that i saw the rainbow 2or 3 times only.

when you ask an engineer about it , you will get alot of physical explaination about defraction of light .

while when you ask an artist about the rainbow you will hear alot about colours and sky.

for me the rainbow is not only colours you can see in a rainy day, but it is God message to people reminding them by a promise.

i think everyone took a promise from God or gave a promise to God,can remeber that promise when he see the rainbow

Now lets have a look on what is rainbow in history ??

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 of Indra, the God of lightning and thunder. 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 move further away.
In the bible, the rainbow is explicitly stated as a sign of the Noahic Covenant between God and The Creation, and the biblical God's promise to Noah that never again would The World be purified by The Deluge (Genesis 9.13-15)