“A rainbow is an optical and meteorological phenomenon that is caused by reflection of light in water droplets in the Earth's atmosphere, resulting in a spectrum of light appearing in the sky. It takes the form of a multicolored arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.”
“Whenever the rainbow appears in the clouds, I will see it and remember the everlasting covenant between God and all living creatures of every kind on the earth.” Genesis 9:16
Genesis 9:1-17 NIV
God’s Covenant With Noah
1Then God blessed Noah and his sons, saying to them, “Be fruitful and increase in number and fill the earth. 2The fear and dread of you will fall upon all the beasts of the earth and all the birds of the air, upon every creature that moves along the ground, and upon all the fish of the sea; they are given into your hands. 3Everything that lives and moves will be food for you. Just as I gave you the green plants, I now give you everything.
4“But you must not eat meat that has its lifeblood still in it. 5And for your lifeblood I will surely demand an accounting. I will demand an accounting from every animal. And from each man, too, I will demand an accounting for the life of his fellow man.
6 “Whoever sheds the blood of man,
by man shall his blood be shed;
for in the image of God
has God made man.
7As for you, be fruitful and increase in number; multiply on the earth and increase upon it.”
8Then God said to Noah and to his sons with him: 9“I now establish my covenant with you and with your descendants after you 10and with every living creature that was with you—the birds, the livestock and all the wild animals, all those that came out of the ark with you—every living creature on earth.
11 I establish my covenant with you: Never again will all life be cut off by the waters of a flood; never again will there be a flood to destroy the earth.”
12And God said, “This is the sign of the covenant I am making between me and you and every living creature with you, a covenant for all generations to come:
13I have set my rainbow in the clouds, and it will be the sign of the covenant between me and the earth.
14Whenever I bring clouds over the earth and the rainbow appears in the clouds,
15I will remember my covenant between me and you and all living creatures of every kind. Never again will the waters become a flood to destroy all life.
16 Whenever the rainbow appears in the clouds, I will see it and remember the everlasting covenant between God and all living creatures of every kind on the earth.”
17So God said to Noah, “This is the sign of the covenant I have established between me and all life on the earth.”