Spotting a rainbow can brighten anyone's day. National Find a Rainbow Day, on April 3, encourages people to look for rainbows, whether arching across the sky after a spring shower, shimmering in a garden sprinkler or scattered across a wall by a glass prism. The day celebrates both the science behind these colorful arcs and the sense of hope and wonder they inspire. Early April, with its mix of sunshine and showers, is a great time to find one.
History of National Find a Rainbow Day
Rainbows have fascinated people for thousands of years. Many cultures have told stories about them: in Norse mythology, a rainbow bridge connects the world of humans to the realm of the gods, and in the Bible, a rainbow appears as a sign of promise after the great flood. In Irish folklore, a pot of gold waits at the rainbow's end.
Scientists also studied rainbows for centuries. In the 1300s, the Persian scientist Kamal al-Din al-Farisi and the German monk Theodoric of Freiberg both explained rainbows using experiments with water-filled glass spheres. In the 1600s, René Descartes described the geometry of rainbows, and Isaac Newton showed that white light can be split into a spectrum of colors with a prism. Newton named seven colors, red, orange, yellow, green, blue, indigo and violet, often remembered as ROY G. BIV.
Rainbows form when sunlight enters raindrops, bends, reflects off the back of the drop, and bends again as it leaves, separating light into its colors. Who created National Find a Rainbow Day is not documented.
Why National Find a Rainbow Day Matters
Rainbows are a beautiful, free natural event that anyone can enjoy. Looking for them encourages people to slow down and notice the world around them.
Rainbows are also a perfect introduction to science, teaching how light, water and angles work together. For many people, they are also a symbol of hope after a storm.
How to Celebrate National Find a Rainbow Day
- Look for a rainbow: stand with the sun behind you after a rain shower.
- Make your own: use a garden hose on a sunny day or a glass of water on a windowsill.
- Learn the colors: memorize ROY G. BIV.
- Eat the rainbow: build a plate with fruits and vegetables of every color.
- Take a photo: share your best rainbow photo with friends.
Celebrating at Work, School and Home
At work, invite coworkers to share rainbow photos or wear different colors to make a 'human rainbow' team picture. In classrooms, students can make rainbows with prisms, flashlights and glasses of water, then draw what they see and learn about the spectrum of light. Younger children can sort objects by color or create rainbow collages. At home, families can make a rainbow with a garden hose on a sunny afternoon, bake a rainbow layer cake or fruit kebab, and keep an eye on the sky during spring showers. Remember to stand with your back to the sun.
Fun Facts About National Find a Rainbow Day
- To see a rainbow, the sun must be behind you.
- A double rainbow has its colors reversed in the outer arc.
- Rainbows are actually full circles, but the ground usually hides the lower part.
National Find a Rainbow Day FAQs
When is National Find a Rainbow Day?
National Find a Rainbow Day is April 3.
How do rainbows form?
Sunlight bends and reflects inside raindrops, splitting into colors.
What are the colors of the rainbow?
Red, orange, yellow, green, blue, indigo and violet.
When is the best time to see a rainbow?
When the sun is low and behind you and rain is falling in front of you.